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I have two points on the circumference of circle, and I also know the center of the circle. I want to calculate the angle between those two points which are on the circumference of circle.

Is this formula suitable to this situation?

$$\tan(\theta) = \frac{y_2-y_1}{x_2-x_1}$$

where $(x_1,y_1)$ are one of the circumference points and $(x_2,y_2)$ is the other point on the circumference.

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    Well, you should shift your circle first so that it's centered at the origin, before you can use the formula for the tangent of the difference of two angles...2012-08-23

2 Answers 2