A bisector of a line segment connecting two points on a circle always goes through the center of the circle.

My comment was regarding the *length* of n1 and n2, not their direction. The illustration implies that the *lengths* of n1 and n2 are each equal to the distance between the respective midpoints and the center of the circle. E.g., ||n1|| == ||m1 - C||. If that were true (which I believe it is not), then finding the center would be trivial.

I'm just commenting that the illustration is misleading in that regard. Showing shorter vectors n1 and n2 (i.e., an unknown distance between the vectors heads and the center) would better highlight the need for the parameterized bisectors. Something like the following:

**Edited by Buckeye, 18 April 2014 - 09:12 PM.**

Please don't PM me with questions. Post them in the forums for *everyone's* benefit, and I can embarrass myself publicly.

You don't forget how to play when you grow old; you grow old when you forget how to play.