Question 1

What is the formula for the area of a circle?

Accepted Answer

A = πr²

Answer

A = 2πr

Answer

A = πd

Answer

A = πr

Question 2

How do you calculate the circumference of a circle with a radius of 5 units?

Accepted Answer

C = 10π units

Answer

C = 25π units

Answer

C = 5π units

Answer

C = πr² units

Question 3

If the area of a circle is 78.5 square units, what is the radius? (Use π ≈ 3.14)

Accepted Answer

5 units

Answer

15 units

Answer

7 units

Answer

10 units

Question 4

Which formula represents the relationship between diameter and radius?

Accepted Answer

d = 2r

Answer

d = πr

Answer

d = r²

Answer

d = r/2

Question 5

If the circumference of a circle is 31.4 units, what is the approximate radius? (Use π ≈ 3.14)

Accepted Answer

5 units

Answer

7 units

Answer

10 units

Answer

15 units

Question 6

How is the area of a circle related to the radius?

Accepted Answer

The area is π times the square of the radius

Answer

The area is the diameter times the radius

Answer

The area is twice the radius

Answer

The area is the circumference divided by the radius

Question 7

What happens to the circumference if the radius of a circle is doubled?

Accepted Answer

The circumference doubles

Answer

The circumference stays the same

Answer

The circumference quadruples

Answer

The circumference is halved

Question 8

If a circle has a diameter of 14 units, what is the circumference? (Use π ≈ 3.14)

Accepted Answer

43.96 units

Answer

14 units

Answer

21.98 units

Answer

28 units

Question 9

What is the formula for the diameter of a circle if you know the circumference?

Accepted Answer

d = C/π

Answer

d = C/2π

Answer

d = C × π

Answer

d = πC

Question 10

How do you calculate the radius if you know the area of a circle?

Accepted Answer

r = √(A/π)

Answer

r = A/2π

Answer

r = Aπ

Answer

r = π/A

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