Question

How do you find the r?

Answer 1

Ok this is a fun little question.


So You are dealing with three sides of a right triangle. that means we can use Pythagorean's thm to solve for R


We know that $A^2 + B^2 = C^2$

r=A
36=B
r+12=C

$r^2 + 36^2 = (r+12)^2$


Next simplify, $r^2 + 1296 = r^2 + 24r + 144 1296-144 = 24r 1152=24r 48=r$

Answer 2

By finding the volume of the shape