Question

NEED HELP LIKE NOW 15 points if answered!!!!!!!
how do you work it out

Answer 1

Remark

You have to stare at this for a moment before you catch on. When you fold the arc into a circle, 8pi becomes the circumference of the base circle.

Formula

C = 2*pi*r

C = 8pi

Solution

8pi = 2pi * r    Divide both sides by 2pi

8pi / 2 pi = r

4 = r                           Answer