[Math]How to check if a point is inside a rectangle or triangle

keywords: Math, check if a point is inside a rectangle or triangle

Rectangle

https://math.stackexchange.com/questions/190111/how-to-check-if-a-point-is-inside-a-rectangle

Triangle

Check whether a point is within a 3D Triangle
https://math.stackexchange.com/questions/4322/check-whether-a-point-is-within-a-3d-triangle

Irregular 2D Polygon

my favorite way to see if a point is inside or outside a path, is using its winding number.
https://twitter.com/FreyaHolmer/status/1232826293902888960

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