The area enclosed by a circle is 36π36\pi 36π square inches. What is the length, in inches, of the diameter of the circle?
A=πr2 A=\pi r^2 A=πr2 36π=πr2 36\pi =\pi r^2 36π=πr2 36=r2 36=r^2 36=r2 6=r 6=r 6=r d=12 d= \boxed{12} d=12