## CBSE Class 9 Maths Chapter 8 Quadrilaterals Revision Notes

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## What are Quadrilaterals?

The origin of the word “quadrilateral” is from the Latin words quadric meaning “a variant of four” and latus meaning “side”. A Quadrilateral is a figure formed by joining four points in order.

#### Properties of Quadrilaterals

1. Quadrilateral has exactly four SAV (Sides, Angles, and Vertices):

- Sides (AB, BC, CD, AD)
- Angles (∠A,∠B, ∠C, ∠D)
- Vertices (A, B, C, D)

2. Sum of the angles of a quadrilateral is 360° (Angle Sum Property)

∠A + ∠B + ∠C + ∠D = 360°

3. A quadrilateral has 2 diagonals; the line joining the opposite vertices

### CBSE Class 9 Maths Chapter 8 Quadrilaterals Revision Notes PDF