# 9th Grade Math Formulas Quiz

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Questions: 10 | Attempts: 1,955  Settings  Math is considered one of the toughest subjects out there, especially by school students. Are you ready for this 9th grade math formulas quiz that we have brought for you? If you are in 9th grade or above and you love math too much, you should not find it difficult to pass this quiz with a good score. These questions will not only test your knowledge of math formulas, but you will also learn more from here. All the best to you!

• 1.

### C=2πr is the formula for

• A.

Circumference of a Triangle

• B.

Area of a Circle

• C.

Circumference of a Circle

• D.

None of these

C. Circumference of a Circle
Explanation
The formula C=2πr represents the circumference of a circle. The circumference is the distance around the outer edge of a circle. The formula states that the circumference is equal to 2 times pi (approximately 3.14) times the radius of the circle. This formula is commonly used to calculate the length of the boundary of a circle.

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• 2.

### What is the formula for the area of a square?

• A.

A=s2

• B.

A=s

• C.

A=s3

• D.

A=s + s

A. A=s2
Explanation
The formula for the area of a square is A=s2. This formula is derived from the fact that a square has all sides equal in length. To calculate the area, we simply multiply the length of one side (s) by itself (s2). This gives us the total area enclosed by the square.

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• 3.

### The area of a Triangle is

• A.

B+H

• B.

BxHx2

• C.

BH/2

• D.

B/H

C. BH/2
Explanation
The correct answer is BH/2. This is because the formula for finding the area of a triangle is base times height divided by 2. In this case, the base is represented by B and the height is represented by H. By multiplying B and H and then dividing the result by 2, we can find the area of the triangle.

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• 4.

### What is the formula for the area of the rectangle?

• A.

A= L + W

• B.

A= W2

• C.

A= L2

• D.

A= L × W

D. A= L × W
Explanation
The formula for the area of a rectangle is A = L × W, where A represents the area, L represents the length, and W represents the width. This formula is derived from the concept that the area of a rectangle is equal to the product of its length and width. Therefore, to find the area of a rectangle, you multiply the length by the width.

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• 5.

### Cosec θ =

• A.

1/sin θ

• B.

1+sin θ

• C.

1/sec θ

• D.

2/sin θ

A. 1/sin θ
Explanation
The cosecant of an angle θ is equal to 1 divided by the sine of θ. This can be derived from the reciprocal identity of sine, which states that the reciprocal of sine is equal to the cosecant. Therefore, the correct answer is 1/sin θ.

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• 6.

### What is the area of a sphere?

• A.

2πr2

• B.

4πr2

• C.

4πr

• D.

4πr3

B. 4πr2
Explanation
The formula for the surface area of a sphere is given by 4πr^2, where r is the radius of the sphere. This formula calculates the total area covered by the surface of the sphere. Therefore, the correct answer is 4πr^2.

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• 7.

### The formula for the cotangent is

• A.

Cotθ = opposite/hypotenuse

• B.

• C.

• D.

Explanation
The given formula for the cotangent is Cotθ = adjacent/opposite. This formula represents the ratio of the length of the adjacent side to the length of the opposite side in a right triangle. The cotangent is a trigonometric function that helps determine the angle's measure based on the lengths of the sides of a triangle. By dividing the length of the adjacent side by the length of the opposite side, we can find the cotangent of the angle.

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• 8.

### Cos θ is equal to

• A.

1/sec θ

• B.

1/sin θ

• C.

1/cosec θ

• D.

1/sin x sec θ

A. 1/sec θ
Explanation
The correct answer is 1/sec θ because the reciprocal of the secant function is equal to the cosine function. Therefore, 1/sec θ is equivalent to cos θ.

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• 9.

### What is the formula for the perimeter of a square?

• A.

P = 2s

• B.

P = 3s

• C.

P = 4s

• D.

P = 8s

C. P = 4s
Explanation
The formula for the perimeter of a square is P = 4s, where P represents the perimeter and s represents the length of one side of the square. This formula is derived from the fact that a square has four equal sides, so to calculate the perimeter, we multiply the length of one side by 4.

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• 10.

### 2 × (L+W) is the formula for

• A.

The perimeter of a triangle

• B.

The perimeter of a rectangle

• C.

The perimeter of a pentagon

• D.

The area of a pentagon Back to top