1.△ABC中,AB=AC,且∠ABC的角平分線交AC於M,已知 BC=BM+MA,則∠ACB=?
2.△ABC是等腰直角三角形,∠A=90度,D是線段AC中點,在線段AC上取一點E,
使得線段AE垂直BD並相交於G點,則∠EDC+∠EAD=?
第一題有試著在BC上取A'點使得△ABM全等於△BMA',然後就卡住了!@@
第二題坐標化搭配正弦的和角公式可以求得角度和是90度
想請教要如何用國中概念求解?
請教版上的大大們~能否給我提示如何切入?
感恩!^^
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