1978 AMC 12 第 7 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。
7.
一个正六边形的两条相对边之间相距 英寸。它的边长（单位：英寸）为
Opposite sides of a regular hexagon are inches apart. The length of each side, in inches, is
小提示：
两条相对边之间的距离等于边心距的两倍
The distance between opposite sides is twice the apothem
大提示：
边长为 的正六边形，其边心距为
A regular hexagon of side has apothem
解答：
两条相对边之间的距离是边心距的两倍，因此为 。于是 ，所以 。
因此，正确答案是 E。
The distance between opposite sides is twice the apothem, hence Therefore so
Therefore, the correct answer is E.
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