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1、第 1 页 共 3 页相似专题课程：相似辅助线相似专题课程：相似辅助线一、单选题一、单选题(共共 5 道，每道道，每道 10 分分) 1.如图，在平行四边形 ABCD 中，E 为 AB 的中点，F 为 AD 上一点，EF 交 AC 于 G，AF=2cm，DF=4cm，AG=3cm，则 AC 的长为（ ）A.9cm B.14cm C.15cm D.18cm2.如图，的 AB 边和 AC 边上各取一点 D 和 E，且使 ADAE，DE 延长线与 BC 延长线 相交于 F，则下列式子正确的是（）A.B.C.D.3.如图，ABC 中，ABAC，在 AB、AC 上分别截取 BD=CE，DE，BC 的延长
2、线相交于点 F， 则下列式子正确的是（ ）第 2 页 共 3 页A.ABAE=ACCF B.ABDF=ACEF C.BDDF=ADEFD.ACDF=ADEF。4.在ABC 中，AB=，AC=4，BC=2，以 AB 为边在 C 点的异侧作等腰直角三角形ABD，使 AB 为ABD 斜边，则线段 CD 的长为（）A.B.C.D.35.在平面直角坐标系 xOy 中，点 A 的坐标为(2，1)，正比例函数 y=kx 的图象与线段 OA 的 夹角是 45，则这个正比例函数的表达式为（） A.y3xB.yxC.y3x 或 yxD.yx 或 y-x第 3 页 共 3 页9JWKffwvG#tYM*Jg&6a*
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