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Suppose the sides of the rectangle ABCD are not parallel to the axis.
Then if A = (p,q) and B = (r, s)
then by Pythagoras, |AB|2 = (p - r)2 + (q - s)2 from which AB can be calculated.
Calculate BC in a similar fashion and then area = AB*BC
If AB is parallel to an axis (say the x axis), then q = s so that q - s = 0 and
|AB|2 simplifies to (p - r)2 + 02
so that |AB| = |p - r|
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