How to find the length of a radius

Practice Questions

ISEE Upper Level Mathematics Achievement › How to find the length of a radius

Questions

6

1

You are exploring the woods near your house, when you come across an impact crater. It is perfectly circular, and you estimate its area to be $169 \pi m^2$ .

What is the radius of the crater?

2

Inscribed angle

Refer to the above diagram. $\overarc {ACB}$ has length $60 \pi$ . Give the radius of the circle.

3

A circle has a circumference of $768\pi m$ . What is the radius of the circle?

4

What is the radius of a circle with circumference equal to $36\pi$ ?

5

What is the value of the radius of a circle if the area is equal to $18\pi$ ?

6

What is the radius of a circle with a circumference of $24\pi$ ?

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