(1)∠EAD=1/2∠BAC-(90°-∠C) =1/2(180°-∠B-∠C)- (90°-∠C) =1/2(∠C-∠B)(2) ∠EFM=90°-(1/2∠BAC+∠B) =90°-1/2(180°-∠B-∠C)- ∠B =1/2(∠C-∠B)
