In news you already knew, Stack Overflow is amazing. Instead of reinventing the wheel with trigonometry for half of an hour trying to remember random stuff from college, you can try one of the multiple solutions in a few minutes.

The tricky part is in naming what you are trying to find, ha!

A quick example of what I was trying to achieve today:
https://stackoverflow.com/questions/10301001/perpendicular-on-a-line-segment-from-a-given-point

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