2018年秋九年级数学上册23.2中心对称23.2.3中心对称随堂检测(新版)新人教版.doc

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123.2.3中心对称1.写出下列各 点关于 原点的对称点 A、B、C、D的坐标: A(3,1), B(-2,3), C(-1,-2), D(2,-3)2.下列各点中哪两个点关于原点 O对称?A(-5,0), B(0,2), C(2,-1), D(2,0), E(0,5) F(-2,1) G(-2,-1)3.点 A(a,2)与 点 B(8,b)关 于原点对称,则 a = _ ,b = _ .4、点(2,-5)与点(2,5) 关于_对称;点(2,-5)与点( -2,5) 关于_对 称;点(2, -5)与点( -2,-5)关于_对称5. 点 A与点 B(1,-6)关于 y轴对称,则点 A关于原点的对称点 C的坐标是( )A. (-1,- 6) B. (6,-1 ) C. (-1,6) D. (1,6)2参考答案1.A(-3,-1);B(2,-3); C(1,2);D(-2,3)2.点 C(2,-1)与 F(-2,1)3.-8;-24.X轴;原点;Y 轴5.D

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