如何计算圆上两点之间的弧角? [英] How do I calculate arc angle between two points on a circle?

问题描述

给出一个已知圆心且在圆上有两个点的圆(即已知半径)，如何确定圆上两点之间的最小圆弧的角度?

Given a circle with a known center point and two points on the circle (thus known radius), how do I determine the angle of the minimum arc between the two points on the circle?

推荐答案

将中心的两个点变成一对向量，然后通过

Turn the center to the two points into a pair of vectors, then shove through this.

因此，cos ^-1 (((x ₁ x ₂ + y ₁ y ₂ + z ₁ z ₂ )/r ² ).

So, cos^-1 ((x₁x₂ + y₁y₂ + z₁z₂) / r²).

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