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3.4 平行四边形( 3 )

3.4 平行四边形( 3 ). 复习回顾 :. 1 、平行四边形有哪些性质?. 2 、平行四边形有哪些判定方法?. 例 1 、如图,在 □ ABCD 中,点 E 、 F 分别在 AB 、 CD 上, AE = CF . 四边形 DEBF 是平行四边形吗?为什么?. 例 2 、如图, □ ABCD 的对角线相交于点 O ,直线 EF 过点 O 分别交 BC 、 AD 于点 E 、 F , G 、 H 分别为 O B 、 OD 的中点,四边形 GEHF 是平行四边形吗?为什么?. 练习:.

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3.4 平行四边形( 3 )

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  1. 3.4平行四边形(3)

  2. 复习回顾: 1、平行四边形有哪些性质? 2、平行四边形有哪些判定方法?

  3. 例1、如图,在□ ABCD中,点E、F分别在AB、CD上,AE=CF.四边形DEBF是平行四边形吗?为什么?

  4. 例2、如图,□ ABCD的对角线相交于点O,直线EF过点O分别交BC、AD于点E、F,G、H分别为OB、OD的中点,四边形GEHF是平行四边形吗?为什么?

  5. 练习: 1、如图,在□ABCD中,过其对角线的交点O,引一条直线交BC于E,交AD于F,若AB=2.4cm,BC=4cm,OE=1.1cm。则四边形CDFE的周长为多少?

  6. 2、如图,在□ABCD中,AB=5,AD=8,∠A、∠D的角平分线分别交BC于E、F,则EF=__________。

  7. 小结与思考: 平行四边形的判定和性质有哪些?

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