AB=AD,AC=AE,∠ABC=∠ADE=90°,BC=与DE相交3于F,证明：CF=EF.

AB:AE=AC:AD,∠1=∠2,证明∠ABC=∠AED 在△ABC中,AD⊥AB,AD=AB,AE⊥AC,AE=AC,求证：BE=CD 如图,D是三角形ABC的边AC上一点,∠CBD的平分线交AC于E,AE=AB,求证：AE×AE=AD×AC 在三角形ABC中,AB：DB=AC：EC 求证AD：AB=AE：AB AD：DB=AE：EC 如图,△ABC内接于圆O,AD⊥BC于D,AE是直径,AB*AC=AD*AE,∠BAC=60°,AD=4,AE=6,求S△ABC 如图所示,AD是△ABC的高,AE是△ABC的外接圆直径,求证:AB×AC= AE×AD. 如图,在三角形ABC中,∠ADE=∠C,则下列等式成立的是A.AD/AB=AE/AC B.AE/BC=AD/BDC.DE/BC=AE/ABD.DE/BC=AD/AB 已知：如图,在△ABC中,AD平分∠BAC,DE‖AC交AB于点E,求证：AE：AB+AE：AC=1 AD=AC AD⊥BC AD=AE AB平分∠DAE,请写出图中三处的全等三角形 如图,在△ABC中,DE∥BC,AD/BD=AE/EC,求证:AD/AB=AE/AC ab⊥ac.ad⊥ae .ab=ac .ad=ae .说明 be⊥cd 如图,DE//BC,请问AD:AC=AE:AB?AD:AE=AB:AC? 如图,已知:∠1=∠2,∠ADE=∠ABC,求证:AD*AC=AB*AE 如图所示,在△ABC和△ADE众,AB=AC,AD=AE,∠DAB=∠EAC,AD,AE交BC于点F,G.求证DE‖B如图所示,在△ABC和△ADE中,AB=AC,AD=AE,∠DAB=∠EAC,AD,AE交BC于点F,G.求证DE‖BC 已知:如图,AB=AD,AC=AE,∠1=∠2.求证:△ABC≌△ADE. 如图,AB=AE,∠1=∠2,AC=AD,求证：△ABC≌△AED 如图,已知AB=AD,AC=AE,∠1=∠2,求证△ABC≌△ADE. 已知,如图,ab=ad,ac=ae,∠1=∠2.求证:△abc≌△ade