2018年中考数学真题分类汇编第三期专题17点线面角试题含解析201901243101.doc

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1点线面角一.选择题(2018广西梧州3 分)已知A=55,则它的余角是( )A25 B35 C45 D55【分析】由余角定义得A 的余角为 90减去 55即可【解答】解:A=55,它的余角是 90A=9055=35,故选:B【点评】本题考查了角的余角,由其定义很容易解得二.填空题(2018云南省昆明3 分)如图,过直线 AB 上一点 O 作射线 OC,BOC=2918,则AOC 的度数为 15042 【分析】直接利用度分秒计算方法得出答案【解答】解:BOC=2918,AOC 的度数为:1802918=15042故答案为:15042【点评】此题主要考查了角的计算,正确进行角的度分秒转化是解题关键

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