Answer:
C. Use the distance formula to prove the lengths of the opposite sides are the same.
Step-by-step explanation:
To prove that the opposite sides of a quadrilateral are congruent, we simply use the Distance formula to prove that the lengths of the given opposite sides are the same.
Take for example a Quadrilateral ABCD, we prove that
Once we have shown that, we can conclude that opposite sides are congruent.
The correct option is C.