1972 AMC 12 第 18 题
先试着解答 1972 AMC 12 第 18 题，然后核对你的答案与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 1972 AMC 12 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
18.
梯形 的底边 长度是底边 的两倍， 为两条对角线的交点。若对角线 的长度为 ，则线段 的长度等于：
Let be a trapezoid with the measure of base twice that of base and let be the point of intersection of the diagonals. If the measure of diagonal is then that of segment is equal to:
其他年份的第 18 题
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