2011 AMC 8 第 13 题
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13.
两个全等正方形 和 的边长均为 。它们重叠形成图中所示的 乘 长方形 。长方形 的面积中有百分之多少被涂阴影?
Two congruent squares, and have side length They overlap to form the by rectangle shown. What percent of the area of rectangle is shaded?
小提示:
比较阴影长方形面积与 乘 长方形面积
Compare the shaded rectangle area with the area of the by rectangle.
大提示:
重叠部分是一个长方形,其宽度为两个边长之和减去
The overlap is a rectangle whose width is the sum of two side lengths minus .
解答:
有
因此 的面积为 。 的面积为 。
,也就是 。
所以正确答案是 C。
We get that
This means that the area of is The area of is
which is
Thus, C is the correct answer.
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