Question

Quadrilateral ABCD has the following

vertices:
A(2, 7)
B(8,1)
C(1, -9)
D(-6, -2)
Is quadrilateral ABCD a parallelogram, and
why?

Answer 1

No because the angle of point C is NOT congruent to the angle of point A.

Explanation:

A quadrilateral MUST be a parallelogram if it has both pairs of its opposite angles congruent.