1953 AMC 12 第 11 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。
11.
一条跑道是由两个同心圆围成的圆环，宽 英尺。两圆的周长之差约为：
A running track is the ring formed by two concentric circles. It is feet wide. The circumferences of the two circles differ by about:
英尺
feet
英尺
feet
英尺
feet
英尺
feet
以上答案均不正确
none of these
答案：C
小提示：
外圆半径比内圆半径大 英尺
The outer radius is feet greater than the inner radius
大提示：
将两个周长相减，未知的内圆半径会消去
Subtract the circumferences; the unknown inner radius cancels
解答：
若内圆半径为 ，则周长之差为 英尺，约为 英尺。
因此，正确答案是 C。
If the inner radius is the difference is feet, which is about feet.
Thus, the correct answer is C.
其他年份的第 11 题
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