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Prove the simple, but extremely useful, result that the perpendicular distance from a point (u, v)...

Prove the simple, but extremely useful, result that the perpendicular distance from a point (u, v) to a line ax + by + c = 0 is given by |au + bv + c| if a 2 + b 2 = 1.

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BY THIS WAY, PROVE EQUATION OF GIVEN PROBLEM.

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