1999 AMC 8 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.
点整时，钟表两根指针形成的较小角的度数是多少？
What is the degree measure of the smaller angle formed by the hands of a clock at o’clock?
答案：C
小提示：
每相邻两个小时刻度相差
Each hour mark is apart
大提示：
点整时，两根指针相隔两个小时刻度
At o’clock, the hands are two hour marks apart
解答：
点整时，时针指向 ，分针指向 。
两根指针相隔整个圆的 。所以角度为
所以正确答案是 C。
At o’clock, we have that the hour hand is at and the minute hand is at
This means that the hands are a of the entire circle apart. This is equal to
Thus, C is the correct answer.
其他年份的第 2 题
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