The origin of the word "quadrilateral" is the two Latin word quadri a variant of four, and latus meaning "side". A quadrilateral is a polygon with four edges (or sides) and four vertices or corners. On certain conditions, Quadrilateral become either a Parallelogram or a Trapezium. Let us study those conditions in detail in this chapter.


These video lectures have been prepared exclusively for all English medium state board and central board class 9th students to have the understanding on basic properties of Quadrilaterals to become a Parallelogram.


Megha holds a B.Tech in Electronics and Communication Engineering from NIT, Kurukshetra. Currently associated with Tutorials Point as a Mathematics Trainer, she delivers lectures for classes 11,12, and IIT JEE students. Apart from Mathematics, she has good experience in designing of Railway's network. In addition, she has worked on various protocols such as Bluetooth 4.1, 6LoWPAN, DASH7, and ZigBee.