AMC 8 2013 Problem 20

AMC8 2013 年第 20

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A 1×2 rectangle is inscribed in a semicircle with longer side on the diameter. What is the area of the semicircle?
一个 1x2 的矩形内接在一个半圆内,矩形的长边和圆的直径重合。那么这个半圆的面积是多少?
  1. A.π2\displaystyle \frac\pi2
  2. B.2π3\displaystyle \frac{2\pi}3
  3. C.π\pi
  4. D.4π3\displaystyle \frac{4\pi}3
  5. E.5π3\displaystyle \frac{5\pi}3

正确答案 · Correct Answer

C

解析 · Solution

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