The coordinates of the centre point of a subsidence trough are calculated by the effect transference angle and the mining depth. 利用平面图形几何重心公式计算回采工作面水平投影图形的重心坐标，然后根据影响传播角和开采深度计算下沉盆地中心位置的坐标。
We apply the method of bargcentric coordinates to give the proof of some geometric inequality conjectures about a motion point that is the triangle in sids. 利用三角形重心坐标证明涉及三角形内部一动点的若干几何不等式猜想。
