8点28分,时钟的分针与时针的夹角(小于180°)是多少度?( )A. 86° B. 75。 C. 49° D. 36°

作者: tihaiku 人气: - 评论: 0
问题 8点28分,时钟的分针与时针的夹角(小于180°)是多少度?( )
选项 A. 86° B. 75。 C. 49° D. 36°
答案 A
解析 分针28分转360°X28/60=168°,时针转速是分针的1/12,28分转168°X1/12= 14°。因为8点整时分针与时针的夹角是360°X8/12 = 240°,所以8点28分的夹角是240° -168°+14° = 86°。

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