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第四章 相似三角形复习课

第四章 相似三角形复习课. 学以致用. A. D. E. C. B. 例题教学 :. A. D. E. C. B. G. 如图, DE∥BC , D 是 AB 的中点, DC 、 BE 相交于点 G 。 求. 1. 如图,在 ABCD 中, E 是 BC 上一点, BE : EC=1 : 2 , AE 与 BD 相交于 F ,则 BF : FD=_______ , S △ADF : S △EBF =______. A. D. 学以致用. F. C. E. B. A. D. O. B. C.

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第四章 相似三角形复习课

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  1. 第四章 相似三角形复习课

  2. 学以致用 A D E C B

  3. 例题教学: A D E C B G 如图,DE∥BC,D是AB的中点,DC、BE相交于点G。 求

  4. 1. 如图,在 ABCD中,E是BC上一点, BE:EC=1:2,AE与BD相交于F,则 BF:FD=_______,S △ADF :S △EBF =______ A D 学以致用 F C E B

  5. A D O B C

  6. A D E N B C M 练一练: 1.如图,正方形ABCD的边长为8,E是AB的中点,点M,N分别在BC,CD上,且CM=2,则当CN=_________时,△CMN与△ADE相似。 1或4

  7. C 学以致用 Q Q A B P P 2.如图,在△ABC中,∠BAC=90°,AB=6,BC=12,点P从A点出发向B以1m/s的速度移动,点Q从B点出发向C点以2m/s的速度移动,如果P、Q分别从A、B两地同时出发,几秒后△ PBQ与原三角形相似?

  8. B 4cm/秒 16 Q P 8 2cm/秒 C A 练一练 在∆ABC中,AB=8cm,BC=16cm,点P从点A开始沿AB边向B点以2cm/秒的速度移动,点Q从点B开始沿BC向点C以4cm/秒的速度移动,如果P、Q分别从A、B同时出发,经几秒钟∆BPQ与∆BAC相似?

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