Question

prove that a (-2,-1) , b (1 ,0) , c (4,3) , d (1,2) are the vertices of a parallelogram

Answer 1

this is the first part of question
4)now find the length of segment da, ac and bd
5)the length of da=√18,ac=√52,bd=√4
6)Therefore as the opposite sides are equal and diagonals are unequal so the points are vertices of a parallelogram