2019届九年级数学上册第四章图形的相似4.7相似三角形的性质课件(新版)北师大版.ppt

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1、7.相似三角形的性质,1.定理:相似三角形 、 、都等于相似比. 2.定理:相似三角形的周长比等于 ,面积比等于 .,对应高的比,对应角平分线的比,对应中线的比,相似比,相似比的平方,1,2,3,4,5,6,7,8,1.(2017重庆中考)若ABCDEF,相似比为32,则对应高的比为( ) A.32 B.35 C.94 D.49,答案,1,2,3,4,5,6,7,2.如图,在ABCD中,E是AD边上的中点,连接BE,并延长BE交CD延长线于点F,则EDF与BCF的对应角平分线之比为( )A.12 B.13 C.14 D.15,答案,8,1,2,3,4,5,6,7,8,3.(2017江苏连云港中

2、考)如图,已知ABCDEF,ABDE=12,则下列等式一定成立的是( ),答案,1,2,3,4,5,6,7,4.将一副三角尺按图中位置叠放,则AOB与DOC的面积之比等于( ),答案,8,1,2,3,4,5,6,7,5.已知ABCDEF,若ABC与DEF的相似比为23,则ABC与DEF对应边上的中线的比为 .,答案,8,1,2,3,4,5,6,7,6.用一个10倍的放大镜放大一个六边形,则该六边形放大后的面积是原来的 倍.,答案,8,1,2,3,4,5,6,7,7.两个相似多边形的最长边分别为6 cm和8 cm,它们的周长之和为56 cm,面积之差为28 cm2,求较小相似多边形的周长与面积.,答案,8,1,2,3,4,5,6,7,8,8.如图,在ABC中,EFBC,且EF= BC=2 cm,AEF的周长为10 cm,试求梯形BCFE的周长.,答案,

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