AMC 8 2010 Problem 23

AMC8 2010 年第 23 题

圆★★★★☆

Semicircles POQ and ROS pass through the center of circle O. What is the ratio of the combined areas of the two semicircles to the area of circle O?

半圆 POQ 和 ROS 通过圆的圆心。则这两个半圆的面积总和与圆的面积的比值是多少？

A. $\displaystyle \frac{\sqrt 2}{4}$
B. $\displaystyle \frac{1}{2}$
C. $\displaystyle \frac{2}{\pi}$
D. $\displaystyle \frac{2}{3}$
E. $\displaystyle \frac{\sqrt 2}{2}$

正确答案 · Correct Answer

B

解析 · Solution

解析整理中

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