2001 AMC 8 第 9 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
9.
大风筝要覆盖金箔。金箔从一张刚好覆盖整个方格的长方形纸上裁出。从四个角裁掉的废料有多少平方英寸？
The large kite is covered with gold foil. The foil is cut from a rectangular piece that just covers the entire grid. How many square inches of waste material are cut off from the four corners?
答案：D
小提示：
高和宽都扩大三倍，面积扩大 倍
Tripling both dimensions multiplies area by
大提示：
废料面积等于大风筝面积
The waste area equals the large kite area
解答：
整个方格的面积是 由风筝面积公式，风筝面积是这个面积的一半，所以废料面积为 。
所以正确答案是 D。
The area of the entire grid would be The area of the kite is one-half this area from the formula for the area of the kite, so the wasted material is
Thus, D is the correct answer.
其他年份的第 9 题
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