△ABC为等边三角形,点D,E分别在BC,AC边上,且AE=CD,AD与BF相交于点F.求证△ABE全等于△CAD和求角BFD的...
问题描述:
△ABC为等边三角形,点D,E分别在BC,AC边上,且AE=CD,AD与BF相交于点F.求证△ABE全等于△CAD和求角BFD的...
△ABC为等边三角形,点D,E分别在BC,AC边上,且AE=CD,AD与BF相交于点F.求证△ABE全等于△CAD和求角BFD的度数.
答
(1)AB=AC,
AE=CD,
∠BAE=∠ACD=60,
∴△ABE≌△CAD(SAS).
(2)△ABE≌△CAD,
∠EAF=∠ABE,
∠AFE=∠FBA+∠BAF
∠AFE=∠FAB+∠EAF=∠BAE=60,
∠BFD=∠AFE
∠BFD=60°.