(江西专用)2019中考数学总复习第一部分教材同步复习第七章图形与变换第26讲尺规作图权威预测.doc

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1第一部分 第七章 第 26讲1如图,在四边形 ABDC中, AB AC, BD DC, A60, D120, B C90,点 E是 AB的中点请仅用无刻度的直尺按下列要求画图(1)在图 1中,请过点 E点作一条直线与 AC平行;(2)在图 2中,画一个以 AE为边长的菱形解:(1)如答图 1,直线 EF即为所求. (2)如答图 2,四边形 AEGF即为所求2如图是由六个大小完全相同的小矩形拼成的大矩形网格,小矩形的顶点称为这个矩形网格的格点,请仅用无刻度直尺在矩形中完成下列画图(1)在图 1中画出一个顶点均在格点上的平行四边形 ABEF;(2)在图 2中画出一个以 CD为对角线且顶点均在格点上的菱形 CGDH.解:如答图 1,平行四边形 ABEF即为所求(画图不唯一)(2)如答图 2,菱形 CGDH即为所求

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