A shape made up of a connected set of points that are all equal distance from a center point.

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Detect collision that happen between frames, between slices of moving, rotating circles?

To detect a collision between two circles, we check if the distance between their centers is smaller than the sum of their radii. To detect a collision between a slice (in this case half) of a circle ...
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How the values of h and the perpendicular had computed

How the values of h and the perpendicular had computed or taken in this answer of a previous question??? please clarify it How can I make a spline out of three points that define circular arc?
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Grab all tiles within a radius?

I'm working on a 2D tile based game. I want NPC's to be able to destroy tiles, and ideally I would have a function, which takes a central x,y and then based upon a circular area from that point ...