In order to prove that a quadrilateral is a parallelogram one must be able to justify that both of the pairs of the opposite sides are in fact parallel with each other. However it's also important to note that if only one pair of the opposite sides are congruent and parallel the quadrilateral is still considered to be a parallelogram. It can sometimes be rather tricky and confusing when it comes to proving quadrilaterals are parallelograms, that's why it's important to review the many different aspects of proving this.

Reference:

Similar Questions

People Also Asked

Top Related Searches

Wikipedia on Ask.com

In Euclidean plane geometry, a quadrilateral is a polygon with four sides (or edges) and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle...