Question

How to find if a triangle is right angle with coordinates?

Answer 1

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Draw it and test the angle that seems likely taking the dot product of the two vectors corresponding to the sides of that vertex. You can test all three if you don't want to draw.

Alternatively calculate the side lengths, if cc is the largest and c2=a2+b2c2=a2+b2 it is a right triangle, otherwise it isn't.




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