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

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How does collisions caculates when developing game in Build an HTML5 Game book

I don't understand authors login when calculating collisions between two circles (bubbles). Here is the Calculating collisions section. Author writes: The bubble being fired follows a set of ...
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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 ...