1988 AMC 12 第 6 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。
6.
一个图形是等角平行四边形的充要条件是它为
A figure is an equiangular parallelogram if and only if it is a
矩形
rectangle
正多边形
regular polygon
菱形
rhombus
正方形
square
梯形
trapezoid
答案：A
小提示：
四个相等的内角之和必须为
The four equal interior angles must add to
大提示：
这里没有任何条件要求相邻边等长
No condition here forces adjacent sides to have equal lengths
解答：
四个相等且总和为 的角都是直角。有四个直角的平行四边形恰好是矩形。
所以正确答案是 A。
Four equal angles summing to are all right angles. A parallelogram with four right angles is exactly a rectangle.
Thus the correct answer is A.
其他年份的第 6 题
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