# Prove that the points (–7, –3), (5, 10), (15, 8) and (3, –5) taken in order are the corners of a parallelogram.

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Make the points as A B C D
NOW take (x , y )
As the interesting points of the diagonals
AC and BD
now find the mid points of AC
(-7+15)/2 and (-3+8)/2
(4,5/2)
Now find the mid point of BD if mid point of AC and BD are same then it is the point of a parallelogram