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平行四边形性质和判定复习

平行四边形性质和判定复习. A. D. O. B. C. 练习:. 1 、已知:如图,在 ABCD 中, AC=6,BD=8 , ( 1 ) AD 的值可能是 ( ) A.AD=1 B.AD=5 C. AD=7 D.AD=9 ( 2 )若△ AOD 的周长为 12 ,则 BC=—— ( 3 )若 AD=5 ,则 ABCD 的面积是 _ __ ,此时,该四边形的边长还有什么特征?.

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平行四边形性质和判定复习

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  1. 平行四边形性质和判定复习

  2. A D O B C 练习: 1、已知:如图,在 ABCD 中,AC=6,BD=8, (1)AD的值可能是( ) A.AD=1 B.AD=5 C. AD=7 D.AD=9 (2)若△AOD的周长为12,则BC=—— (3)若AD=5,则 ABCD的面积是___,此时,该四边形的边长还有什么特征?

  3. 练习2:如图,在 ABCD中,∠C=65°,DB=DC,AE⊥BD于E,试求∠DAE的度数。 练习3:用一条直线把平行四边形面积2等分,你怎么办?

  4. 例1:如图,在 AECF中,B、D在对角线的两点,且 ,求证:四边形ABCD为平行四边形。 DF=BE

  5. 练习1:如图,在 ABCD中,O是对角线AC、BD的交点,E、F、G、H分别是OA、OB、OC、OD的中点, 求证:四边形EFGH是平行四边形。

  6. 探索题 如图,在 ABCD中,E、F分别是AB、CD上的动点,AF与DE交于点G,CE与BF交于点H,连结GH。 (1)当E、F分别到AB、DC的中点时,判断四边形EHFG的形状,并说明理由。 (2)试探究:①当AE,CF满足什么条件时,一定有GH∥CD,且GH=1/2CD? ②当AE,CF满足什么条件时,一定有四边形是平行四边形?

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