16 pi ~ 50.2654825
the circumference is two times the radius, or 2r. so if the radius was 3, the circumference would be 6. if the radius was 4, the circumference is 8.
If the radius of a circle is 8 feet the circumference is about 50.27 feet.
Circumference = 2*pi*radius So Radius = Circumference/(2*pi) = 8/(2*pi) = 4/pi = 1.2732 (to 4 dp)
The circumference will be 50.27
If the radius of the circle is 8 cm the circumference is: about 50.27 cm (r x 2 x pi = circumference).