Changed Coordinates

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Little johny was working on the co-ordinate plane.As he is still a novice he calculates the distance between two points P1 and P2 in the wrong way.He calculates the distance between P1(x1,y1) and P2(x2,y2) as : D(P1,P2) = |x1 - x2| + |y1 - y2| His teacher gave him a homework to calculate the area of a circle of radius R. Johny is aware of the definitions of all the figures just like any smart ki

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solution.cppC++17

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