How to identify if points are on the left or right side of a circle

Question

Suppose I have a series of points that are on a 2D plane, and I know they can be fitted to some part of the circumference of a circle.

How can I determine that the points lie on the left or right side of the circle, if they circle were to be split into two semicircles?

score 3 · Answer 1 · answered Nov 13 '13 at 12:09

3

If the cosine of the angle is negative, the point is on the left side.If the cosine of the angle is positive, the point is on the right side.

answered Nov 13 '13 at 12:09

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1 Answers1