A quadrilateral is a four-sided shape, where the sides are straight and meet at four vertices. The prefix “quad” means four. There are several types of quadrilaterals. Can you name them?

CBSE Class 9th Quadrilaterals - Introduction and Types of Quadrilaterals. In this video you will learn about quadrilaterals, properties of quadrilaterals and classifications of quadrilaterals.

Take any quadrilateral such as ABCD above. Construct the midpoints of each side and join them to form another quadrilateral EFGH. Varignon's Theorem asserts that the ...