AMC 8 2012 Problem 25

AMC8 2012 年第 25

四边形与多边形★★★★
A square with area 4 is inscribed in a square with area 5, with one vertex of the smaller square on each side of the larger square. A vertex of the smaller square divides a side of the larger square into two segments, one of length a, and the other of length b. What is the value of ab?
一个面积为 4 的正方形内接在一个面积为 5 的正方形内,小正方形的每个顶点分别落在大正方形的每条边上。小正方形的某个顶点将大正方形的一条边分成了 2 条线段,长度分别是 a 和 b,那么 ab 的值是多少?
AMC 8 2012 Problem 25 figure
  1. A.15\displaystyle \hspace{.05in}\frac{1}5
  2. B.25\displaystyle \hspace{.05in}\frac{2}5
  3. C.12\displaystyle \hspace{.05in}\frac{1}2
  4. D.1\hspace{.05in}1
  5. E.4\hspace{.05in}4

正确答案 · Correct Answer

C

解析 · Solution

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