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in Coordinate Geometry by (47.9k points)
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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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Let A, B, C and D represent the points (-7, -3), (5, 10), (15, 8) and (3, -5) respectively.

Using the distance formula 

i.e. The opposite sides are equal. 

Hence ABCD is a parallelogram.

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