If there is no 'Y' coordinate then it is considered the 'origin'.
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The point whose Cartesian coordinates are (2, 0) has the polar coordinates R = 2, Θ = 0 .
They're all points on the x-axis.
From the given coordinates it would form a line segment whose end points are (5, 2) and (0, 2) and so there is no 4 sided quadrilateral.
Origin is at points (0, 0) in coordinate geometry. If you are shifting/translating the origin, you have to add the respective x and y coordinates of the new origin with respect to the old origin to get the coordinates of the new origin.
To get the midpoint between two points, the x-coordinate of the resulting point is the average of the x-coordinates of your two points. Similar for the y-coordinate. Take the average of the endpoints, calculate the average of the x-coordinates.