Circles

1

What is a commonly used value of \pi?

2

Which of the following is not a formula to find the circumference of a circle?

3

What is the formula to find the area of a circle?

4

What is the circumference of a circle that has a diameter of {7}~{cm}?

5

What is the circumference of a circle that has a radius of {5}~{cm}?

6

What is the diameter of a circle that has a circumference of {15}~{cm}?

7

What is the area of a circle that has a radius of {5}~{cm}?

8

What is the area of a circle that has a diameter of {16}~{cm}?

9

What is the area of a half circle that has a radius of {10}~{cm}?

10

What is the radius of a circle that has an area of {42}~{cm}^{2}?