2019中考数学一轮复习第一部分教材同步复习第四章三角形第16讲一般三角形及其性质5年真题精选.doc

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1第一部分 第四章 第 16讲命题点 1 三角形内角和与外角1(2018昆明 11题 4分)在 AOC中, OB交 AC于点 D,量角器的摆放如图所示,则 CDO的度数为( B )A90 B95 C100 D1202(2015昆明 4题 3分)如图,在 ABC中, B40,过点 C作CD AB, ACD65,则 ACB的度数为( D )A60 B65C70 D75命题点 2 三角形中的重要线段3(2018曲靖 11题 3分)如图,在 ABC中, AB13, BC12,点 D, E分别是AB, BC的中点,连接 DE, CD如果 DE2.5,那么 ACD的周长是_18_.4(2015昆明 11题 3分)如图,在 ABC中, AB8,点 D, E分别是 BC, CA的中点,连接 DE,则 DE_4_.5(2014昆明 5题 3分)如图,在 ABC中, A50, ABC70, BD平分 ABC,则 BDC的度数是( A )2A85 B80C75 D70

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