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Polar or radial coordinates are part of a coordinate system where the location of any point P, (relative to the origin, O) is given by its |OP|, the distance of P from O and the angle made by OP with the positive direction of the horizontal line from O (the line going due East.
Apart from the case where the distance, r is 0, any pair of Polar coordinates can be mapped to a pair of Cartesian coordinates using:
x = r cos A
y = r sin A
and conversely,
r = |sqrt(x2 + y2)|
A = tan-1(y/x) if x not 0
0 when A = 0
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