Question

A circle has a circumference of 32.4 mm. Find the radius and the diameter. Round your answers to two decimal places.

5.16 mm; 10.31 mm
10.31 mm; 5.16 mm
5.16 mm; 2.58 mm
2.58 mm; 5.16 mm

Answer 1

5.16 mm; 10.31 mm

Explanation:

Circumference:
`C = 2\pi r`

So all you do is:

`32.4=2\pi r\\32.4/2\pi = r\\5.16 = r`

and then the radius is just half of the diameter so

`5.16*2=10.31`