Description: Learn to identify quadrilaterals such as kites, trapezoids, parallelograms, rhombuses, rectangles, and squares by line and angle type. Created by Sal Khan. Or we could also say there are two pairs of congruent sides here as well. We have two pairs of parallel and congruent sides, but all the sides aren't equal to each other. We have two pairs of sides that are parallel to each other, but now all the sides have an equal length.*Teacher Advisor is 100% free.