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How do I calculate the intersection(s) of a straight line and a circle? - Mathematics Stack Exchange
[http://math.stackexchange.com/questions/228841/how-do-i-calculate-the-intersections-of-a-straight-line-and-a-circle] - - public:elrengo
Vector reflection
Cross Product
geometry - How do you detect where two line segments intersect? - Stack Overflow
[http://stackoverflow.com/questions/563198/how-do-you-detect-where-two-line-segments-intersect] - - public:elrengo