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运用几何原理．对三沟尺的测量原理进行了分析，在此基础上对T3形（凸三边形）产品的内切圆特性进行分析．得出三沟尺测量T3形（凸三边形）产品内切国直径的正确方法．
Use geometric principles. The measuring principle of Sangou ruler is analyzed. Based on the analysis, the inscribed circle characteristic of T3 (convex triangular) product is analyzed. The correct method of measuring the diameter of T3-shaped (convex triangular) product in Sangou ruler is obtained.