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已知:如图,DE∥BC,AB=14,AC=18,AE=10,求AD的长.
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如图已知D.是AC上一点AB=DADE∥AB∠B.=∠DAE求证BC=AE
如图DE∥BCAB=16AC=12AD=10则AE=________
如图DE是ABC中AC边的垂直平分线若BC=8厘米AB=10厘米则EBC的周长为厘米
16
28
26
18
.如图△ABC中AB=AC=10BC=8AD平分∠BAC交BC于点D.点E.为AC的中点连接DE则△
20
18
14
13
如图∠1=∠2要证明△ABC≌△ADE还需补充的条件是
AB=AD,AC=AE
AB=AD,BC=DE
AB=DE,BC=AE
AC=AE,BC=DE
如图已知∠1=∠2要证明△ABC≌△ADE还需补充的条件是
AB=AD,AC=AE
AB=AD,BC=DE
AC=AE,BC=DE
以上都不对
已知点D.E分别在△ABC的边AB.AC上下列给出的条件中不能判定DE∥BC的是A.BDAB=CEA
已知如图在△ABC中AB<ACBC边上的垂直平分线DE交BC于D.点交AC于点E.AC=8cm△AB
已知如图AC⊥BC于C.DE⊥AC于E.AD⊥AB于A.BC=AE.若AB=5则AD=_______
已知点D.E.分别在△ABC的边AB.AC上下列给出的条件中不能判定DE∥B.C.的是
)BD︰AB = CE︰AC; (
)DE︰BC = AB︰AD; (
)AB︰AC = AD︰AE; (
)AD︰DB = AE︰EC.
如图在△ABC中点DE分别在边ABAC上DE∥BC已知AE=6则EC的长是
4.5
8
10.5
14
已知如图△A.BC中AB=ACAD是BC边上的中线AE∥BCCE⊥AE垂足为E.1求证△ABD≌△C
已知如图△A.BC中AB=ACAD是BC边上的中线AE∥BCCE⊥AE垂足为E.1求证△ABD≌△C
已知如图在△ABC中AB<ACBC边上的垂直平分线DE交BC于点D交AC于点EAC=8△ABE的周
已知如图在△ABC中BC=AC以BC为直径的⊙O.与边AB相交于点D.DE⊥AC垂足为点E.1求证点
已知如图在△ABC中AB<ACBC边上的垂直平分线DE交BC于点D.交AC于点E.AC=8△ABE的
如图8-26已知△ABC中AB=AC∠BAC=120°D为BC上一点且DE⊥ABDF⊥AC通过上述条
已知如图在直角梯形ABCD中AD∥BC∠ABC=90°DE⊥AC于点F交BC于点G交AB的延长线于
如图已知AB=ADAC=AE∠1=∠2求证BC=DE.
如图DE是△ABC中边AC的垂直平分线若BC=18cmAB=10cm则△ABD的周长为
16 cm
28 cm
26 cm
18 cm
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