Question

show that the following points taken in order form the vertical of a parallelogram A(-7,-3),B(5,10),C(15,8),D(-5,-6)

Answer 1

I give you some hints in this question
In this we find AB BC CD AD the sides of parallelogram by using distance formula after this we find the diagonals AC and BD
If the opposite side are equal and diagonal are not equal but bisect each other at 90° then it will be a parallelogram