3,680 sq. in.
(36*20)*4= 2880
(20*20)*2= 800
The answer is
3^66483360316461674016
Assuming that CB is tangent, this is just a right triangle with a hypotenuse of 20 and a side of 12 so by the Pythagorean Theorem:
20^2=12^2+x^2
400=144+x^2
x^2=400-144
x^2=256
x=16
