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如图,在等边三角形ABC中,点D,E分别在BC,AB上,且∠ADE=60°. 求证:△ADC∽△DEB.
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已知在△ABC中∠
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△ABC的三边长分别abc且a+2ab=c+2bc则△ABC是
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△ABC中①若AB=BC=CA则△ABC是等边三角形②属于轴对称图形且有一个角为60°的三角形是等边
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如图在等边三角形ABC中点D.E.分别在边BCAC上且DE∥AB过点E.作EF⊥DE交BC的延长线于
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1如图1△ABC和△CDE都是等边三角形且B.C.D.三点共线联结ADBE相交于点P.求证BE=AD
如图在等边三角形ABC中点DE分别在边BCAC上DE∥AB过点E作EF⊥DE交BC的延长线于点F.1
如图在等边三角形ABC中点D.E.分别在边BCAC上且DE∥AB过点E.作EF⊥DE交BC的延长线于
如图△ABC是等边三角形分别延长AB至F.BC至D.CA至E.使AF=3ABBD=3BCCE=3CA
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∵∠A.=∠
=∠
,∴△ABC是等边三角形 B.∵AB=AC,且∠B.=∠C.,∴△ABC是等边三角形 C.∵∠A.=60°,∠B.=60°,∴△ABC是等边三角形
∵AB=AC,∠B.=60°,∴△ABC是等边三角形
如图△ABC是等边三角形D.是AB边上的一点以CD为边作等边三角形CDE使点E.A.在直线DC的同侧
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在△ABC中,∵∠A=∠B=∠C,∴△ABC为等边三角形
在△ABC中,∵AB=AC,且∠B=∠C,∴△ABC为等边三角形
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如图△ABC是等边三角形D.是AB边上一点以CD为边作等边三角形CDE使点E.A.在直线DC的同侧连
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