3.4 平行四边形( 3 )
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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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