18`S, 175`E by the usual measure, or -18.00, 175.00 in polar.
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absolute relative and polar coordinates definition
If the polar coordinates of a point P are (r,a) then the rectangular coordinates of P are x = rcos(a) and y = rsin(a).
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That is because - for example - some calculations are easier in polar coordinates, and some are easier in rectangular coordinates. For example, complex numbers are easier to add and subtract in rectangular coordinates, and easier to multiply and divide in polar coordinates.
The abscissa in Cartesian coordinates. In polar coordinates, it would be the radius .or domain