题目内容
A.BB′⊥AC B.BC=B′C
C.∠ACB=∠ACB′ D.∠ACB=∠AB′C
(1)按照下列要求画出图形:
①作∠BAC的平分线交BC于点D;②过D作DE⊥AB,垂足为点E;③过D作DF⊥AC,垂足为点F.
(2)根据上面所画的图形,求证:EB=FC.