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It is possible to work out the coordinates of a missing corner of a rectangle given the coordinates of the other three corners.
Example
Three of the corners of a rectangle are at (4,2), (8,2) and (4,8).
Find the coordinates of the fourth corner.
Answer
(4, 2) and (8, 2) are the base points because the y-coordinate is 2 compared to (4, 8).
The missing point must have its y-coordinate at 8 also.
(4, 2) and (8, 2) have x-coordinates which differ by 4, so the missing point must have its x-coordinate 4 more than (4,8).....i.e. 4 + 4 = 8.
The missing point has coordinates (8, 8).
