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如图,在平行四边形ABCD中,O是对角线AC的中点,过点O作AC的垂线与边AD、BC分别交于E、F.求证:四边形AFCE是菱形.
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如图平行四边形ABCD的对角线交于点O且AB=5△OCD的周长为23则平行四边形ABCD的两条对角线
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下列说法正确的是
对角线相等的四边形是平行四边形
对角线相互垂直的四边形是平行四边形
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两条对角线的中点同为一点的四边形是平行四边形
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如图平行四边形ABCD的对角线交于点O.且AB=7△OCD的周长为23则平行四边形ABCD的两条对角
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