选择题
2010 AMC 8 Problem 18: Decorative Window
A decorative window is made up of a rectangle with semicircles at either end. The ratio of AD to AB is 3:2. And AB is 30 inches. What is the ratio of the area of the rectangle to the combined area of the semicircles?
A.
2:3
B.
3:2
C.
6:pi
D.
9:pi
E.
30:pi