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如图13-2-20所示,E、F是四边形ABCD的对角线AC上的两点,AF=CE,DF=BE,DF∥BE.求证:△AFD≌△CEB.
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∵四边形ABCD是矩形∴四边形ABCD的对角线相等补充以上推理的大前提是
正方形都是对角线相等的四边形
矩形都是对角线相等的四边形
等腰梯形都是对角线相等的四边形
矩形都是对边平行且相等的四边形
因为四边形ABCD是矩形所以四边形ABCD的对角线相等以上推理的大前提是
矩形都是四边形;
四边形的对角线都相等;
矩形都是对角线相等的四边形;
对角线都相等的四边形是矩形
如图在四边形ABCD中对角线ACBD相交于点O.AE=CF且四边形DEBF是平行四边形.求证四边形A
已知如图E.F.是四边形ABCD的对角线AC上的两点AF=CEDF=BEDF//BE.求证四边形AB
如图四边形ABCD是平行四边形AC是对角线BE⊥AC垂足为E.DF⊥AC垂足为F.求证BE=DF.
若一个四边形的一条对角线把四边形分成两个等腰三角形我们把这条对角线叫这个四边形的和谐线这个四边形叫做
四边形一条对角线所在直线上的点如果到这条对角线的两端点的距离不相等但到另一对角线的两个端点的距离相等
如图在平行四边形ABCD中对角线AC.BD相交于点O.F.E.是对角线AC上的两点当E.F.满足下列
OE=OF
DE=BF
∠ADE=∠CBF
∠ABE =∠CDF
∵四边形ABCD是矩形∴四边形ABCD的对角线相等.以上推理的大前提是
正方形都是对角线相等的四边形
矩形都是对角线相等的四边形
等腰梯形都是对角线相等的四边形
矩形都是对边平行且相等的四边形
如图所示在四边形ABCD中E.F.G.H.分别是ABBCCDDA的中点请添加一个与四边形ABCD对角
若一个四边形的一条对角线把四边形分成两个等腰三角形且其中一个等腰三角形的底角是另一个等腰三角形底角的
如图18所示四边形ABCD是边长为13cm的菱形其中对角线BD长10cm求1对角线AC的长度;2菱形
如图E.F.是四边形ABCD对角线AC上的两点AD∥BCDF∥BEAE=CF.求证1△AFD≌△CE
如图E.F.是四边形ABCD的对角线AC上两点AF=CEDF=BEDF∥BE.求证1△AFD≌△CE
如图EF.是四边形ABCD的对角线AC上两点AF=CEDF=BEDF∥BE求证1ΔAFD≌ΔCEB2
如图在四边形ABCD中对角线AC.BD交于E.∠CBD=90ºBC=4BE=ED=3AC=10则四边
6
12
20
24
已知:如图EF是四边形ABCD的对角线AC上的两点AF=CE连接DEDFBEBF.四边形DEBF为平
已知如图在四边形ABCD中AB∥CDE.F.为对角线AC上两点且AE=CFDF∥BE.求证四边形AB
如图在四边形ABCD中E.F.G.H.分别是AB.BD.CD.AC的中点要使四边形EFGH是菱形则四
四边形ABCD是梯形
四边形ABCD是菱形
对角线AC=BD
AD=BC
如图四边形ABCD中E.F.G.日分别为各边的中点顺次连结E.F.G.H.把四边形EFGH称为中点四
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