Mục Lục
Concept of the Basic Mathematics Formulas
The basic mathematics formula is generally used in basic maths and which are not only used in academic books but also in our daily lives. In the primary class, we all have learned about the general BODMAS rule. As one keeps on approaching the higher classes from six to ten one will come across the various mathematics formula based on various concepts such as algebra.
By practicing the questions and answers based on various formulas one can by heart each and every formula before appearing for the exams.
Some of the other concepts which have formulas are given below:
- Fractions
- Percentage
- Formula for proportion
- Geometry
- Trigonometric formulas and many more.
Basic Mathematics Formula
The basics of math display how a math problem can be solved with the help of some equations like the equation of forces, accelerations, or the work done. More importantly, they are used to provide mathematical solutions for real-world problems in our day-to-day life.
There are many types of equations, and they are found in many areas of maths. But the techniques used to examine them differ according to their type. It can be as simple as the basic addition formula or can be complicated as integration of differentiation.
Basic Geometry Formulas
- The perimeter of Square = P = 4a
Where ‘a’ is the length of the sides of square
- Perimeter of Rectangle = P = 2(l + b)
Where ‘l’ is Length and ‘b’ is Breadth
- The area of Square = A = a2
Where ‘a’ is the length of the sides of a Square
- The area of Rectangle = A = l × b
here ‘l’ is Length and ‘b’ is breadth
- Area of Triangle = A = ½ × b × h
Where ‘b’ is the base of the triangle and ‘h’ is the height of the triangle
- Area of Trapezoid = A = ½ × (b1 + b2) × h
Where b1 and b2 are the bases of the Trapezoid; h = height of the Trapezoid
- Area of Circle = A = π × r2
- Circumference of Circle = A = 2πr
Where ‘r’ is the radius of a Circle
- Surface Area of Cube = S = 6a2
Where ‘a’ is the length of the sides of the Cube
- The curved surface area of Cylinder = 2πrh
- The total surface area of Cylinder = 2πr(r + h)
- The volume of Cylinder = V = πr2h
Where ‘r’ is the radius of the base of Cylinder and ‘h’ is height of Cylinder
- The curved surface area of a cone = πrl
- Total surface area of cone = πr(r + l) = πr[r + √(h2 + r2)]
- Volume of a Cone = V = ⅓ × πr2h
Here, ‘r’ is the radius of the base of Cone and h = Height of the Cone
- Surface Area of a Sphere = S = 4πr2
- Volume of a Sphere = V = 4/3 × πr
Where, r = Radius of the Sphere
Basic Probability Formula
P(A) = n(A)/n(S) Where,
|
Basic Arithmetic Formulas
Arithmetic mean (average) = Sum of values/Number of values.
16 Critical Math ACT Math Practice Formulas You MUST Know
Let’s break down exactly what the Math section of the ACT consists of. There are 60 total multiple-choice questions taken from six areas of math: pre-algebra, elementary algebra, intermediate algebra, coordinate geometry, plane geometry, and trigonometry. Thus, the scoring and what math formulas you need to know breaks down like this:
- Pre-Algebra / Elementary Algebra: 24 Questions, 24 Points
- Intermediate Algebra / Coordinate Geometry: 18 Questions, 24 Points
- Plane Geometry / Trigonometry: 18 Questions, 24 Points
Here’s the thing about the ACT math section: even with all the ACT math test prep you did, the ACT doesn’t give you a cheat sheet with all the math formulas written down on them. Therefore, it’s up to you to memorize them. But some critical ACT math formulas are required more frequently than others. These are the must-knows. While it might be tempting to just make a guess and move, it’s better if you’re prepared from the get-go.
Let’s take a look at the most important formulas per section.
Pre-Algebra / Elementary Algebra
These formulas involve basic math and algebra. In other words, it requires the student to solve for an unknown variable.
1. Arithmetic mean (average) = Sum of values / Number of values
Specifically used to calculate the mean value of a given set of numbers.
For example: (10 + 12 + 14 + 16) / 4 = 13
2. Probability = Target outcomes / Total outcomes
Specifically used to calculate the chances of something occurring from a set of possible outcomes.
For example: A jar contains five blue marbles, five red marbles, and ten white marbles. What is the probability of picking a red marble at random?
5 / 20 = .25 or 25%
3. Quadratic Formula: x = −b ± √b²-4ac/2a
Specifically used for determining the x-intercepts of a quadratic (parabolic) equation.
For example: A = 1, B = 4, C = 4
- x = -4 ± √4² – 4 (1)(4) / 2(1)
- x = -4 ± √ 16 – 4(4) / 2
- x = -4 ± √16 – 16 / 2
- x = -4 ± √ 0 / 2
- x = -4 / 2
- x = -2
Intermediate Algebra / Coordinate Geometry
These formulas help calculate distances, lengths, and properties of points on a plane, as well as solve for variables in more complex algebraic expressions.
4. Distance Formula: d=√(x₁ – x₂)² + (y₁ – y₂)²
Specifically calculates the distance between two points on a coordinate plane.
For example: Find the distance between points (6, 6) and (2, 3)
- d=√(6 – 2)² + (6 – 3)²
- d=√(4)² + (3)²
- d=√16 + 3
- d=√25
- d = 5
5. Slope Formula: Slope = y₂ – y₁ / x₂ – x₁
Specifically calculates the slope (angle) of a line that connects two points on a plane.
For example: Coordinates = (-2, -1) (4, 3)
- s = 3 – (-1) / 4 – (-2)
- s = 4 / 6
- s = 2 / 3
6. Slope Intercept: y=mx+b
Formula that defines a line on a plane, given a known slope and y-intercept.
For example: Slope = 2, Intercept point (0,3)
- y = 2x+3
7. Midpoint Formula: (x₁+x₂) / 2, (y₁+y₂) / 2
Specifically calculates the midpoint between to points on a plane.
For example: Find the midpoint between (-1, 2) and (3, -6)
- (-1 + 3) / 2, (2 + -6) / 2
- 2 / 2, -4 / 2
- Midpoint (1, -2)
Plane Geometry
Formulas for calculations attributes of geometric shapes within a plane and solving for variables based on the angles of a given shape (trigonometric identities).
8. Area of Triangle: area = (1/2) (base) (height)
Specifically calculates the total area within a triangle based on the lengths of the sides.
For example: Base = 5, Height = 8
- a = 1/2 (5)(8)
- a = 1/2 (40)
- a = 20
9. Pythagorean Theorem: a²+b²=c²
Used specifically to calculate the length of an unknown side of a right triangle, given two sides are known.
For example: a = 3, b = 4
- c² = 3² + 4²
- c² = 9 + 16
- c² = 25
- c = √25
- c = 5
10. Area of Rectangle: area = length x width
Calculates specifically the total area within a rectangle shape.
For example: length = 5, width = 2
- a = 5 x 2
- a = 10
11. Area of Parallelogram: area = base x height
Specifically calculates the total area within a parallelogram.
For example: base = 6, height = 12
- a = 6 x 12
- a = 72
12. Area of Circle: π * r²
Calculates specifically the total area within a circle.
For example: radius = 4
- a = π x 4²
- a = π x 16
- a = 50.24
13. Circumference of Circle: circumference = 2π * r
Calculates specifically the length of the outline of a circle.
For example: radius = 7
- c = 2π x 7
- c = 43.98
Trigonometry
Continues with the previous plane geometry section.
14. Sine (SOH): Sine = opposite / hypotenuse
A trigonometric identity that represents the relative sizes of the sides of a triangle and can also be used to calculate unknown sides or angles of the triangle.
For example: opposite = 2.8, hypotenuse = 4.9
- s = 2.8 / 4.9
- s = 0.57
15. Cosine (CAH): Cosine = adjacent / hypotenuse
A trigonometric identity that represents the relative sizes of the sides of a triangle and can also be used to calculate unknown sides or angles of the triangle.
For example: adjacent = 11, hypotenuse = 13
- c = 11 / 13
- c = 0.85
16. Tangent (TOA): Tangent = opposite / adjacent
A trigonometric identity that represents the relative sizes of the sides of a triangle and can also be used to calculate unknown sides or angles of the triangle.
For example: opposite = 15, adjacent = 8
- t = 15 / 8
- t = 1.87
Average formula:
Let a1,a2,a3,……,an be a set of numbers, average = (a1 + a2 + a3,+……+ an)/n
Percent:
Percent to fraction: x% = x/100
Percentage formula: Rate/100 = Percentage/base
Rate: The percent.
Base: The amount you are taking the percent of.
Percentage: The answer obtained by multiplying the base by the rate
Fractions formulas:

Converting an improper fraction to a mixed number:

Formula for a proportion:

In a proportion, the product of the extremes (ad) equal the product of the means(bc),
Thus, ad = bc
Consumer math formulas:
Discount = list price × discount rate
Sale price = list price − discount
Discount rate = discount ÷ list price
Sales tax = price of item × tax rate
Interest = principal × rate of interest × time
Tips = cost of meals × tip rate
Commission = cost of service × commission rate
Geometry formulas:
Perimeter:
Perimeter of a square: s + s + s + s
s:length of one side
Perimeter of a rectangle: l + w + l + w
l: length
w: width
Perimeter of a triangle: a + b + c
a, b, and c: lengths of the 3 sides
Area:
Area of a square: s × s
s: length of one side
Area of a rectangle: l × w
l: length
w: width
Area of a triangle: (b × h)/2
b: length of base
h: length of height
Area of a trapezoid: (b1 + b2) × h/2
b1 and b2: parallel sides or the bases
h: length of height
volume:
Volume of a cube: s × s × s
s: length of one side
Volume of a box: l × w × h
l: length
w: width
h: height
Volume of a sphere: (4/3) × pi × r3
pi: 3.14
r: radius of sphere
Volume of a triangular prism: area of triangle × Height = (1/2 base × height) × Height
base: length of the base of the triangle
height: height of the triangle
Height: height of the triangular prism
Volume of a cylinder:pi × r2 × Height
pi: 3.14
r: radius of the circle of the base
Height: height of the cylinder
Basic Maths Formulas List
Some of the Basic Math Formulae are listed below:


Solved Maths Examples


Step 2: Divide the result by 5 , to get 3.
Step 3: Multiply the result by -2 to get -6.
Step-4: Add the result in 16 to get 10.
Thus the final result is 10.
Important Maths Formulas | Area Formulas
- Area of a Circle Formula = π r2
where
r – radius of a circle
- Area of a Circle Formula = π r2


Area of a Triangle Formula A=1/2bh
where
b – base of a triangle.
h – height of a triangle.



where:
a be the measure of the equal sides of an isosceles triangle.
b be the base of the isosceles triangle.
h be the altitude of the isosceles triangle.
5. Area of a Square Formula = a2

6. Area of a Rectangle Formula = L. B
where
L is the length.
B is the Breadth.

7. Area of a Pentagon Formula = 5/2s.a
Where,
s is the side of the pentagon.
a is the apothem length.


when it is made to lie on one of the bases of it.

where
s is the length of any side
n is the number of sides
tan is the tangent function calculated in degrees

11. Area of a Parallelogram Formula = b . a
where
b is the length of any base
a is the corresponding altitude

Area of Parallelogram: The number of square units it takes to completely fill a parallelogram.
Formula: Base × Altitude
12. Area of a Rhombus Formula = b . a
where
b is the length of the base
a is the altitude (height).

13. Area of a Trapezoid Formula = The number of square units it takes to completely fill a trapezoid.
Formula: Average width × Altitude

where
b1, b2 are the lengths of each base
h is the altitude (height)

Sector Area – The number of square units it takes to exactly fill a sector of a circle.
15. Area of a Segment of a Circle Formula

16. Area under the Curve Formula:
The area under a curve between two points is found out by doing a definite integral between the two points. To find the area under the curve y = f(x) between x = a & x = b, integrate y = f(x) between the limits of a and b. This area can be calculated using integration with given limits.

Algebra Formulas | Maths Formulas
1. a2−b2=(a+b)(a−b)
2. (a+b)2=a2+2ab+b2
3. a2+b2=(a−b)2+2ab
4. (a−b)2=a2−2ab+b2
5. (a+b+c)2=a2+b2+c2+2ab+2ac+2bc
6. (a−b−c)2=a2+b2+c2−2ab−2ac+2bc
7. (a+b)3=a3+3a2b+3ab2+b3;(a+b)3=a3+b3+3ab(a+b)
8. (a−b)3=a3−3a2b+3ab2−b3
9. a3−b3=(a−b)(a2+ab+b2)
10. a3+b3=(a+b)(a2−ab+b2)
11. (a+b)4=a4+4a3b+6a2b2+4ab3+b4
12. (a−b)4=a4−4a3b+6a2b2−4ab3+b4
13. a4−b4=(a−b)(a+b)(a2+b2)
14. a5−b5=(a−b)(a4+a3b+a2b2+ab3+b4)
15. (x+y+z)2=x2+y2+z2+2xy+2yz+2xz
16. (x+y−z)2=x2+y2+z2+2xy−2yz−2xz
17. (x−y+z)2=x2+y2+z2−2xy−2yz+2xz
18. (x−y−z)2=x2+y2+z2−2xy+2yz−2xz
19. x3+y3+z3−3xyz=(x+y+z)(x2+y2+z2−xy−yz−xz)
20. x2+y2=12[(x+y)2+(x−y)2]
21. (x+a)(x+b)(x+c)=x3+(a+b+c)x2+(ab+bc+ca)x+abc
22. x3+y3=(x+y)(x2−xy+y2)
23. x3−y3=(x−y)(x2+xy+y2)
24. x2+y2+z2−xy−yz−zx=12[(x−y)2+(y−z)2+(z−x)2]
25. if n is a natural number, an−bn=(a−b)(an−1+an−2b+…+bn−2a+bn−1)
26. if n is even n = 2k, an+bn=(a+b)(an−1−an−2b+…+bn−2a−bn−1)
27. if n is odd n = 2k+1, an+bn=(a+b)(an−1−an−2b+…−bn−2a+bn−1)
28. (a+b+c+…)2=a2+b2+c2+…+2(ab+bc+…)

Root Maths Formulas
Square Root :
If x2 = y then we say that square root of y is x and we write √y = x
So, √4 = 2, √9 = 3, √36 = 6
Cube Root:
The cube root of a given number x is the number whose cube is x.
we can say the cube root of x by 3√x
- √xy = √x * √y
- √x/y = √x / √y = √x / √y x √y / √y = √xy / y.
Fractions Maths Formulas
What is fraction ?
Fraction is name of part of a whole.
Let the fraction number is 1 / 8.
Numerator : Number of parts that you of the top number(1)
Denominator : It is the number of equal part the whole is divided into the bottom number (8).
We hope the Maths Formulas for Class 6 to Class 12, help you. If you have any query regarding Class 6 to Class 12 Maths Formulas, drop a comment below and we will get back to you at the earliest.
Importance of Math Formulas for Students
Math formulas were created by some of the most intelligent people for a reason. They help kids to solve questions with speed and accuracy. It also helps to make the process of reaching a solution to a sum much easier as opposed to attempting it from scratch. The benefits of math formulas are given below:
- A child has to follow the curriculum set by the school which is time-sensitive. At periodic intervals, kids are tested on their knowledge through different examinations such as units, half-yearlies, and finals. Thus, to ensure that students have prepared the subject matter in time with a buffer for revision they require math formulas.
- While revising, a child probably isn’t going to solve several questions using a pen and paper. Thus, in order to have a quick glance at sums and how to solve them children need to know formulas as they are the keys to getting correct answers.
- During examinations, kids do not have the luxury to derive an entire formula to solve a question implying that they cannot start from step 1. They must know and remember formulas in order to complete their question paper within the given amount of time thus, helping them in scheduling and organizing their time.
- For students who are attempting competitive exams, they need to not only know formulas but also the various tips and tricks associated with them. As these exams are usually in the form of MCQs thus, kids must have a very good grasp of math formulas.
Important Math Formulas
Before we see the list of the most important math formulas, it is very important to keep in mind that every topic in mathematics is interlinked. If you are not comfortable with a few formulas, irrespective of whether they appear in exams more frequently, you must work on your skills and build a robust understanding of them. Thus, knowledge of all formulas is a must; however, the given list gives you an idea of what kind of math formulas are usually used to solve examination questions.
1. Algebra
- Arithmetic mean or average = sum of all values/ number of values
- Quadratic Formula: x = [-b ± (√b2 – 4ac)]/2a
2.Coordinate Geometry
- Distance Formula: d=√[(x₁ – x₂)2 + (y₁ – y₂2]
- Slope-Intercept: y = mx + b
- Midpoint Formula: [(x₁ + x₂)/2, (y₁ + y₂)/2]
3. Plane Geometry
- Pythagorean Theorem: a2 + b2 = c2
- Area of Triangle = (1/2) × base × height
- Area of Rectangle = length × width
4. Trigonometry
- Sine = perpendicular/hypotenuse
- Cosine = base /hypotenuse
Tips To Memorize Math Formulas
There are hundreds of math formulas that kids have to learn during their entire school life career. Thus, it is important for students to have a few tips that can help them in remembering the math formulas accurately. A few tricks are given below:
- Understanding: It is essential that a child comprehends the concept behind a math formula. If he knows the derivation and has a clear concept formation of the purpose behind the math formula then chances are that a child won’t even have to memorize it. He will automatically know how and when to apply the correct math formula.
- Practice: Till you do not solve a question that requires the use of a particular formula it will be very difficult for you to gauge the use of it. By solving numerous questions, you start remembering a formula through muscle memory. Hence, you won’t have to make an active effort in learning formulas as you already know the application of it.
- Make revision sheets: Once you are introduced to a topic and start attempting questions on the same, make a sheet of all the math formulas that you are using. Keep updating it as you continue your learning cycle. When the time comes for you to have a quick look at these formulas or if you want to memorize them, this sheet can be consulted. Additionally, you can also take the help of Cuemath with the math formulas listed above
- Mnemonics and memory techniques: There are many mnemonic devices available that can assist you in learning math formulas. For example, if you want to learn the basic trigonometric formulas, the mnemonic available is “Some People Have, Curly Brown Hair, Through Proper Brushing.” Thus, the highlighted letters help you to memorize the formulas, sine = perpendicular/hypotenuse, and so on. If you use these memory techniques or come up with your own innovative mnemonics, it will become very easy for you to learn math formulas.
Real Life Applications of Math Formulas
While learning a topic it is helpful for students to know the real-life applications of the associated math formulas as it makes the subject more relatable. Some of the areas where mathematical formulas are used are listed below:
Algebra:
Algebraic formulas are widely used in the field of computer science for performing various analytical functions. They are also used in cryptography for the protection of financial information. Additionally, you use algebra on a daily basis, knowingly and unknowingly, to plan your schedule and do your tasks.
Calculus:
Integration and differentiation formulas in calculus are widely used in engineering. It is also used for rocket trajectory analysis, materials science, shock wave physics code development, modeling airflow over aerodynamic bodies, heat transfer, seismic wave propagation for earthquake analysis, signal processing, and so on.
Geometry:
Geometry formulas are widely used in construction and architecture to build different types of structures. They are also used in terrain modeling, design of mechanical parts, cryptology, and airflow patterns.
Probability and Statistics:
The probability and statistics formulas, as well as techniques learned in school, can be applied to real-life examples. They are used in fields such as Monte Carlo simulation, signal processing, reliability analysis, risk analysis, stock market prediction models, computer network designs, pricing insurance, estimation of ocean currents in geostatistics, etc.
Perimeter Formulas
The perimeter of a figure is the sum of the length of its sides. This is the length around the outside of the figure.

Area Formulas
The area of a figure is the amount of surface the figure covers.

Let’s Look Specifically at the Area and Perimeter of a Rectangle
The perimeter of a rectangle is the distance around the outside or the sum of all 4 sides. Since the two lengths are the same and the two widths are the same, we can use the formula:
P=2l + 2w
The area of a rectangle is length x width.
Below you will see a diagram of a rectangle with an illustration of how we can find the perimeter and area of a rectangle.

Now, that you reviewed the formula, we’ll use our area and perimeter formulas for a rectangle in order to solve a problem.
Example 1 – Finding the Perimeter of a Rectangle

Now, that was pretty easy, huh? Simply substitute the given values for each variable, and evaluate. Let’s try the area formula.
Example 2 – Finding the Area of a Rectangle

There are so many formulas that we could use as examples! There are several formulas for circles and think about all of the formulas that you use in science. This is definitely an algebra skill that is used in everyday life.
Let’s take a look at one more formula, just for practice. This is an easy scientific formula – the distance formula.
Example 3 – The Distance Formula

I’m sure that you’ve been using formulas for a while in your math studies. I’m hoping that you know have a better sense of the difference between perimeter and area. If not, please make sure that you watch the video above where I am better able to explain these differences.
FAQs (Frequently Asked Questions)
Q1. What is a Formula?
Ans. A formula is a fact or the rule that is written with all the mathematical symbols. It usually connects two or more than two quantities with an equal sign. When one knows the value of one quantity the one can also find the value of the other using the formula respectively.
Q2. Give Examples of Some Basic Math Formulas.
Ans. Some examples of the basic math formulas:
- Perimeter of a rectangle = 2 (length + width)
- Area of rectangle = length × width
- The perimeter of a square = 4 × side length
- Area of square =Side length × side length
- The volume of cuboid = length × width × height
- Profit = Selling price – cost price
- Loss = Cost price – selling price
Q3. What is the Importance of Learning Basic Math Formulas?
Ans. Following are the reasons for which we need to know and learn the basic maths formulas:
- Basic Maths formulas help all the students to complete the syllabus in a unique do-learn-do pattern of study.
- It improves the score in Board Exams and Entrance Examinations.
- It makes complete Preparation easy on time.
What is Math Formula?
A Math formula can be seen as an expression that is used as a key to solving problems quickly and effectively. They also include identities which are statements that hold true for all values of a particular variable. Thus, math formulas are very important for children to learn and understand.
Do you Need to Memorize all the Math Formulas?
It is crucial for kids to understand the concept behind a math formula. Once a child has in-depth knowledge then he can move on to learning and memorizing formulas as he will have to quickly recall them during exams. However, if he knows how the math formula was derived and the meaning behind it, a child will automatically remember a formula.
What are the Most Important Math Formulas?
Important math formulas refer to those formulas that appear frequently in most school or competitive exams. However, you should give equal importance to all formulas in order to receive a holistic mathematical development. The list of important math formulas is given below.
- Average = sum of all values/total number of values
- Area of Triangle = (1/2)*(base)*(height)
- Perimeter of Square = 4 * side
- Determinant of a quadratic equation = b2 – 4ac
What are the Basic Math Formulas?
The basic math formulas can be used to solve simple questions or are required to build up more complicated formulas. Here is the list of some basic math formulas.
- Algebraic Identities: (a + b)2 = a2 + b2 + 2ab, (a – b)2 = a2 + b2 – 2ab, a2 – b2 = (a + b) (a – b)
- Pythagoras Theorem: perpendicular2 + base2 = hypotenuse2
- Distance Formula: d=√(x₁ – x₂)2 + (y₁ – y₂)2
- Slope of a Line: m = y2 – y1 / x2 – x1
Why are Math Formulas so Important?
Math formulas give children an easy and quick way to solve difficult problems. All kids need to do is figure out the correct formula to solve the questions and they can proceed seamlessly. Especially, when we consider the scenario of an examination that is timed, it becomes necessary to use these math formulas so that the paper can be finished well within the given limit.
Is It Necessary to Know How Does a Math Formula Work?
It is very crucial for students to know how math formulas work. Kids need to start with developing an understanding of the concept behind a formula and building a clear foundation of the derivation. If children have this knowledge then they won’t have to memorize the formulas. Even if they forget what math formula to apply for a particular question during a test paper they will know the method and not get stuck.
How do you Teach Math Formulas?
The first step in teaching math formulas is to explain to students the meaning behind the formula. The next step is to introduce children to the derivation of the formula. Finally, you need to show kids how to apply the math formula to questions, both simple and complex.
How Can We Apply Math Formulas in Everyday Life?
When we talk about a topic such as fractions or decimals, we apply the formulas to activities such as cross-checking whether the receipt we get from a purchase is correct or not, when we have to divide an object such as a pizza amongst people, and so on. Thus, knowingly or unknowingly, we make use of math formulas to go about our daily lives effectively.
1. What is the best way to memorize Math Formulas?
The best way to remember math formulas to learn how to derive them. If you can derive them then there is no need to remember them.
2. How to learn Mathematics Formulas?
Don’t try to learn the formula try learning the logic behind the formula and intuition behind it.
3. What is Math Formula?
Generally, each kind of maths has a formula or multiple formulas that help you work out a particular thing, whether it’s geometry, statistics, measurements, etc.
4. Is it necessary to know how does a math formula work?
It is indeed necessary to understand and be able to solve equations, either if you want to work as a mathematician, or any other field using mathematics, or if you want to be a math teacher or a teacher in a field that uses math.
✅ Math Formulas ⭐️⭐️⭐️⭐️⭐
Để lại một phản hồi