Check whether two given lines are orthogonal or not.
Two lines are orthogonal if they create a right angle at their intersections.
here (x1,y1) and (x2,y2) form a line.
Back to basics 5 - Clipboard
Sophie Germain prime
Length of the hypotenuse
Rotate a matrix without using rot90
Last non-zero digit
No of squares in a grid
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