Question

If the circumference of a circle is 84.5 ft, find the radius.

Answer 1

r = 13.5 ft

Explanation:

The circumference of a circle of radius r is C = 2(pi)r.

Here, C = 84.5 ft = 2(pi) r, or

C = 84.5 ft = 6.28r

Dividing both sides by 6.28 results in the value of r:

r = 84.5 ft / 6.28 = 13.5 ft

Answer 2

13.448, rounded off: 13.5 ft

Explanation:

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

Where r = radius, C = circumference.

`r=(84.5)/(2\pi ) =13.448` = 13.5 ft