《建筑工人》2000年第9期《弦切角定理在圆弧曲线定位中的应用》一文叙述了弦切角定理在圆弧曲线定位时适用于无障碍物挡视线的情况。现介绍在有障碍物挡住视线时,运用弦切角定理越过障碍物测设圆弧曲线的方法,如图1所示。 “Construction workers” in 2000 No. 9 “chord cut angle theorem in the application of arc curve positioning,” a paper describes the chord cut angle theorem in the application of arc curve for obstacle avoidance line of sight. Are introduced in the block with obstruction sight, the use of chord cut angle theorem over the obstacle measured arc curve method, shown in Figure 1.