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用立体几何的推理方法，推算出在穿层巷道中测量煤（岩）层真厚的简便公式。这个公式只需要在穿层巷道中测量出煤（岩）层的真倾角，巷道穿过煤（岩）层的水平距离和煤（岩）层真倾向与巷道方向的锐夹角即可换算出煤（岩）层的真厚度。
Using the three-dimensional geometric reasoning method, a simple and convenient formula for measuring the true thickness of coal (rock) layer in the tunneling through strata is deduced. This formula only needs to measure the true inclination of the coal (rock) layer in the tunnel through the tunnel, the horizontal distance of the tunnel through the coal (rock) layer and the sharp included angle between the true tendency of the coal (rock) layer and the tunnel direction The true thickness of coal (rock) layer.