浙江省2019年中考数学复习第四章几何初步与三角形第四节等腰三角形课前诊断测试.doc

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1第四节 等腰三角形课前诊断测试1如图,点 A 的坐标是(2,2),若点 P 在 x 轴上,且APO 是等腰三角形,则点 P 的坐标不可能是( )A(2,0) B(4,0) C(2 ,0) D(3,0)22如图,在 RtABC 中,C90,CAB 的平分线交 BC 于点 D,DE 是 AB 的垂直平分线,垂足为 E.若 BC3,则 DE 的长为( )A1 B2C3 D43(2018四川成都中考)等腰三角形的一个底角为 50,则它的顶角的度数为_4(2018贵州遵义中考)如图,ABC 中,点 D 在 BC 边上,BDADAC,E 为 CD 的中点,若CAE16,则B 为_度5已知实数 x,y 满足|x8| 0,则以 x,y 的值为两边长的等腰三角形的周长是y2 10y 25_. 6如图,已知点 A(0,2),B(2 ,2),C(0,4),过点 C 向右作平行于 x 轴的射线,点 P 是射线上的动3点,连结 AP,以 AP 为边在左侧作等边APQ,连结 PB,BA.(1)当 ABPQ 时,点 P 的横坐标是_;(2)当 BPQA 时,点 P 的横坐标是_. 2参考答案1D 2.A 3.80 4.37 5.18 或 216(1) (2)0 或 22 33 3

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