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It is the sum of the y-coordinates of the vertices divided by the number of vertices.
The abscissa in Cartesian coordinates. In polar coordinates, it would be the radius .or domain
If cartesian coordinates are used then the second number in an ordered pair is the y coordinate, also known as the ordinate. If polar coordinates are used then the second number is the angle.
They are the coordinates.
Cartesian coordinates are plotted on the Cartesian plane which consist of a horizontal x axis number line and a vertical y axis number line whereas both axes are perpendicular to each other and meet at right angles at the point of origin whose coordinates are at (0, 0)