Square side

Calculate length of side square ABCD with vertex A[0, 0] if diagonal BD lies on line p: -4x -5 =0.

Correct result:

a =  1.77


v(A,BD)=40+05(4)2+02=1.25 u=AC=BD=2v(A,BD)=2.5  u=2a a=u/2=1.77

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