JJAP+trapezoid

Level 0: The trapezoid is a quadrilateral with at least one pair of parallel sides.
"Isosceles Trapezoids." //Sparknotes: Geometry: Theorems: Theorems for Other Polygons//. Web. 8 Dec 2009. .

This is the most important because it al
====so is crucial to the definition of what a trapezoid is. If there are two pairs of parallel sides, it becomes a parallelogram. It can have two pairs of congruent sides, but not two pairs of parallel sides.====