## CBSE Revision Notes Class 8 Maths Chapter 3: Understanding Quadrilaterals

CBSE Revision Notes Class 8 Maths Chapter 3 Understanding Quadrilaterals are provided to help the students understand and revise the concepts right from the beginning. The concepts taught in Class 8 are important to be understood as these concepts are continued in classes 9 and 10. To score good marks in Class 8 mathematics examination, it is advised to solve questions provided in the Revision Notes Class 8 Maths Chapter** 3**. These revision notes for Class 8 Maths help the students to revise all the concepts in a better way.

Swiflearn provides Revision Notes and keynotes chapter wise for the CBSE board exam in an easy-to-understand, free downloadable PDF format so students can use it for their studies and score better in their board exams. The CBSE Class 8 Revision Notes are made for the main subjects of Science and Maths. These core subjects are very critical as they are the stepping stones and plays a crucial role in student’s future. They might be tricky for students. The CBSE Class 8 Revision Notes for each chapter will enable them to have an expert studying pattern with which they can enjoy learning the subject and perform better in the exams.

CBSE Class 8 Maths Revision Notes are designed keeping in my mind the exam pattern and syllabus of NCERT 2020-21. Students can download the PDF for free and practice the questions to score well in the coming exams.

## CBSE Revision Notes Class 8 Maths Chapter 3: Understanding Quadrilaterals

## What is a Polygon?

A polygon is a plane figure that is bounded by a finite chain of straight lines segments closing in a loop to form a closed polygonal chain or circuit. These segments are called its edges or sides, and the points where two edges meet are the polygon’s vertices (singular: vertex) or corners. To form a polygon, we need a minimum of 3 sides.

## Classification of Polygons:-

Polygons are classified according to the number of sides or vertices they have:-

Polygons with three sides are called triangle. Polygons with 4 sides are called quadrilateral, but Polygon with two sides such as of a line segment does not exist according to the definition.

## What is a diagonal?

A diagonal is a line segment connecting two non-consecutive vertices of a polygon. For a polygon of n sides, the number of diagonals is given by 𝑛(𝑛−3)/

2 .