How do u find the circumference of a circle?

Question

with an area 36pie square centimeters

Answer 1

You mean "pi".  "Pie" is the name of a round, baked dessert.  

A = pi ^ r^2, so if A = 36pi, then

36 pi = pi r^2

36 = r^2

r = 6 centimeters.

This means the circumference is

C = 2 pi r

C = 2 pi * 6

C = 12pi centimeters.