AMC 8 2010 Problem 18

AMC8 2010 年第 18 题

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A decorative window is made up of a rectangle with semicircles on 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 areas of the semicircles?

一种装饰性窗户是由一个矩形和位于两端的半圆组成。已知 AD：AB＝3：2，AB 长为 30 英寸，那么矩形的面积和两个半圆面积之和的比值是多少？

A.2:3
B.3:2
C. $6:\pi$
D. $9: \pi$
E. $30: \pi$

正确答案 · Correct Answer

C

解析 · Solution

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