距 B 点 D 的点的轨迹是一个以 B 为圆心、半径为 D 的圆。因此，将角平分线与该圆相交。会有两个交点；选择 ABC 三角形之外的一个。
The locus of a point that's a distance D from a point B is a circle with radius D centred at B. So intersect the angle bisector with this circle. There will be two points of intersection; pick one that's outside the ABC triangle.
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距 B 点 D 的点的轨迹是一个以 B 为圆心、半径为 D 的圆。因此，将角平分线与该圆相交。会有两个交点；选择 ABC 三角形之外的一个。
The locus of a point that's a distance D from a point B is a circle with radius D centred at B. So intersect the angle bisector with this circle. There will be two points of intersection; pick one that's outside the ABC triangle.