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Polar coordinates would have us on an r value from the core, and a kind of x/y from there. Since the r would be basically static (not true but basically), we'd be considered to be on just an x/y coordinates. Thus flat.

Polar coordinates would have us on an r value from the core, and a kind of x/y from there. Since the r would be basically static (not true but basically), we'd be considered to be on just an x/y coordinates. Thus flat.

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[–] • -1 pt

You're thinking of polar coordinates as a way to define a 'cartesian world'. You're thinking in cartesian first and then polar is supposed to convert to it.

Flat is defined as two dimensional. If you think in polar first instead of cartesian first. You will see the earth's surface can be represented in two dimensions.