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如图,四边形ABCD中,∠A=∠C=90°,BE平分∠ABC,DF平分∠ADC,试问BE与DF平行吗?为什么?
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已知四边形ABCD下列说法正确的是
当AD=BC,AB∥DC时,四边形ABCD是平行四边形
当AD=BC,AB=DC时,四边形ABCD是平行四边形
当AD=BD,AC平分BD时,四边形ABCD是矩形
当AC=BD,AC⊥BD时,四边形ABCD是正方形
平行四边形ABCD中AC平分∠DABAB=2则平行四边形ABCD的周长为
4
6
8
12
已知四边形ABCD下列说法正确的是
当AD=BC,AB∥DC时,四边形ABCD是平行四边形
当AD=BC,AB=DC时,四边形ABCD是平行四边形
当AC=BD,AC平分BD时,四边形ABCD是矩形
当AC=BD,AC⊥BD时,四边形ABCD是正方形
如图在四边形ABCD中AB∥CD∠BAD=90°AB=5BC=12AC=13.求证四边形ABCD是矩
如图四边形ABCD是平行四边形BE平分∠ABCCF平分∠BCDBE.CF交于点G.若使那么平行四边形
∠ABC=60°
AB:BC=1:4
AB:BC=5:2
AB:BC=5:8
已知四边形ABCD下列说法正确的是
当AD=BC,AB//DC时,四边形ABCD是平行四边形
当AD=BC,AB=DC时,四边形ABCD是平行四边形
当AC=BD,AC平分BD时,四边形ABCD是矩形
当AC=BD,AC⊥BD时,四边形ABCD是正方形
探究如图①在四边形ABCD中∠BAD=∠BCD=90°AB=ADAE⊥CD于点E.若AE=10求四边
如图平行四边形ABCD中AB=3BC=5AC的垂直平分线交AD于E.若AC=4则①△CDE的周长比△
①②④
①②③
②③④
①②③④
已知四边形ABCD下列说法正确的是
当AD=BC,AB∥DC时,四边形ABCD是平行四边形
当AD=BC,AB=DC时,四边形ABCD是平行四边形
当AC=BD,AC平分BD时,四边形ABCD是矩形
当AC=BD,AC⊥BD时,四边形ABCD是正方形
如图平行四边形ABCD中AB=3BC=5AC的垂直平分线交AD于E.若AC=4则①△CDE的周长比△
①②④
①②③
②③④
①②③④
类比等腰三角形的定义我们定义有一组邻边相等的凸四边形叫做等邻边四边形.1如图1在四边形ABCD中添加
如图四边形ABCD是平行四边形BE平分∠ABCCF平分∠BCDBECF交于点G.若使EF=AD那么平
∠ABC=60°
AB:BC=1:4
AB:BC=5:2
AB:BC=5:8
如图四边形ABCD为平行四边形∠BAD的角平分线AE交CD于点F交BC的延长线于点E.1求证BE=C
已知四边形ABCD下列说法正确的是
当AD=BC,AB∥DC时,四边形ABCD是平行四边形
当AD=BC,AB=DC时,四边形ABCD是平行四边形
当AC=BD,AC平分BD时,四边形ABCD是矩形
当AC=BD,AC⊥BD时,四边形ABCD是正方形
如图在四边形ABCD中AB=ADCB=CD对角线ACBD相交于点O.下列结论中:①∠ABC=∠ADC
类比等腰三角形的定义我们定义有一组邻边相等的凸四边形叫做等邻边四边形1概念理解如图1在四边形ABCD
问题探究1如图①△ABC中AB=AC=5BC=6点D.在BC上若AD平分△ABC的面积请你画出线段A
如图所示在四边形ABCD中∠B.=90°AB=4BC=3CD=12AD=13求四边形ABCD的面积
类比等腰三角形的定义我们定义有一组邻边相等的凸四边形叫做等邻边四边形.1概念理解如图1在四边形ABC
如图四边形ABCD中AB∥CDAC平分∠BADCE∥AD交AB于E.求证四边形AECD是菱形
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