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両方の状況 Aが鋭角のとき、ABの垂直二等分線とACの交点がAC上にある この時点でBAC=50° B=65° Aが鈍角のとき、ABの垂直二等分線とACの交点はCAの延長線上にある この時点でBAC=130° B=25°
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