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时间:2017-12-22
《八年级数学下册同步拔高(综合 强化)人教版 勾股定理应用-折叠专题》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、八年级数学下册同步拔高(综合+强化)人教版勾股定理应用-折叠专题一、单选题(共5道,每道20分)1.如图,在△ABC中,AD是BC边的中线,∠ADC=30°,将△ADC沿AD折叠,使C点落在C′的位置,若BC=4,则BC′的长为() A. B. C.4 D.3 2.如图,在矩形ABCD中,AB=12cm,BC=6cm,点E、F分别在AB、CD上,将矩形ABCD沿EF折叠,使点A、D分别落在矩形ABCD外部的点A1、D1处,则整个阴影部分图形的周长为() A.18cm B.36cm C.40cm D.72cm 3.如图,在直角坐标系中,将矩形OABC沿OB对
2、折,使点A落在A′处,已知OA=2,AB=1,则点A′的坐标是() A.第3页共3页 B. C. D. 4.如图,将矩形纸片ABCD沿EF折叠,使点A与点C重合,点D落在点G处,EF为折痕,AB=8,AD=4,则四边形ECGF的面积为() A.6 B.10 C.12 D.16 5.如图,正方形ABCD中,AB=6,点E在边CD上,且CD=3DE.将△ADE沿AE对折至△AFE,延长EF交边BC于点G,连结AG、CF.下列结论:①△ABG≌△AFG;②BG=GC;③AG∥CF;④S△FGC=3.其中正确结论的个数是() A.1 B.2 C.3 D.4 第3页共3页9J
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