In the previous post, we have proved that if the opposite sides of a quadrilateral are congruent, then they are parallel. In this post, we are going to show that if the opposite angles of a quadrilateral are congruent, then it is a parallelogram. In the figure below, we have quadrilateral ABCD with and . […]

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# Monthly Archives: October 2014

## Congruent Opposite Sides of Quadrilaterals are Parallel

In this post, we are going to discuss one basic concepts of quadrilaterals. That is, if we have a quadrilateral, and the opposite sides are congruent, then these opposite sides are parallel. This is the same if the two opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram. Consider the quadrilateral below. […]

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