Mathematics
Senior High
なぜこうなるんですか？
外角の二等分線と比
理 AABC の頂点Aにお
A
る外角の二等分線と対辺
ECの延長との交点をQとす
ると,QはBC を AB: AC
B
C
Q
に外分する。
すなわち
BQ:QC = AB:AC
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