Centroid Command

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Centroid( <Polygon> )
Returns the centroid of the polygon.
Example:
Let A = (1, 4), B = (1, 1), C = (5, 1) and D = (5, 4) be the vertices of a polygon. Polygon(A, B, C, D) yields poly1 = 12. Centroid(poly1) yields the centroid E = (3, 2.5).
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