two circles, ofe for the top and one for the bottom plus a rolled up rectangle for the sides). r = radius Areas = 1 12 h = height s..... Area = h(2atr) Circumference Part a: Assume that the height of your cylinder is 6 inches. Consider A as a function of r, so we can write that as A (r) = 2 mr+ 12 mr. What is the domain of A (r)? In other words, for which values of r is A (r) defined