Question

Find the radius of a circle if the circumference is 66cm​

Answer 1

r = 10.50

Explanation:

Circumference =

`2\pi \: r`

`66 = 2\pi \: r`

`(66)/(2\pi) = r`

r = 10.5

Answer 2

Approximately 10.5, or 10.5095541.

Explanation:

To find the radius given the circumference of a circle, we first have to divide the circumference by pi, or an estimation of 3.14. This will give us the diameter.

Since we know that the radius of a circle is simply half the diameter, we divide the number we got from the problem above by 2. This will give you your answer!