There are six main types of quadrilaterals that are defined by their properties. ... 7–8. A quadrilateral is a four-sided shape, where the sides are straight and meet at four vertices.

Chapter 8 - Quadrilaterals of Class 9 Maths Book introduces students to quadrilaterals. It explains various types of quadrilaterals and discusses their properties.

Learn about angles in triangles and quadrilaterals with this BBC Bitesize Maths article. For students between the ages of 11 and 14.