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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）.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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