The perimeter of a semicircle is 10.28 millimeters. What is the semicircle's radius?

Question

Please help! I need help in like less than 2 hours!

Answer 1

The perimeter of a circle is given by:

P = 2 * π * r where r is the raduis.

Therefore the length of a semicircle is π * r

The radius is therefore

r = 10.28mm / π = 3.272mm