Points are stored using an implicit Cartesian coordinate system.
point(x, y)
Point of Cartesian coordinates (x, y).
point(r, a)
Point of polar coordinates (r, a).
abscissa(A)
Abscissa of point A.
ordinate(A)
Ordinate of point A.
distance(A, B)
Distance between point A and point B.
barycenter(list)
Barycenter of a set of weighted points. In the given list, each point has to be followed by its weight.
Example: barycenter(A, 1, B, 3, C, 2)
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