1997 AMC 12 第 2 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。
2.
图示十边形的相邻边均成直角。它的周长是多少？
The adjacent sides of the decagon shown meet at right angles. What is its perimeter?
答案：D
小提示：
所有未标长度的向右水平边的长度之和等于底边的长度
The unlabeled rightward horizontal lengths together equal the bottom width
大提示：
将标出的高度与上方台阶的高度相加，求出图形的总高度
Find the total vertical extent by combining the labeled height and the upper step
解答：
向右水平边的长度之和为 ，所以所有水平边的长度之和为 。图形的总高度为 ，所以所有竖直边的长度之和为 。因此周长为 ，正确答案是 D。
The total of the rightward horizontal sides is so all horizontal sides total The full height is so the vertical sides total Therefore the perimeter is and the correct answer is D.
其他年份的第 2 题
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