Circles test questions

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 \({42}~{cm}^{2}\)?