Revision Notes For CBSE Class 9 Math Chapter -8 Quadrilaterals

In geometry, a quadrilateral is defined as a polygon with four sides and four vertices. The word quadrilateral is derived from the two Latin words Quadri refers to a variant of four, and the word latus means the sides. The total sum of interior angles quadrilateral is equal to 360 degrees. Square, rhombus, rectangle, trapezium, and parallelograms are called a special type of quadrilaterals.

The formulas used for finding an area of any of the quadrilaterals is A = b * h

Properties of Quadrilateral

  • Every quadrilateral has 4 vertices and 4 sides enclosing 4 angles.
  • The sum of its interior angles is 360 degrees.
  • A quadrilateral which has all 4 equal sides and 4 angles as 90 degrees is a square.
  • A quadrilateral which has opposite sides equal and all 4 angles as 90 degrees is a rectangle.

Download Class 9 Maths Chapter 8 Notes 

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Frequently asked Questions on CBSE Class 9 Maths Notes Chapter 8: Quadrilaterals


What is a ‘Quadrilateral’?

In geometry a quadrilateral is a four-sided polygon, having four edges/sides and four corners/vertices.


What are the types of ‘Quadrilateral’?

Quadrilaterals can be classified into Parallelograms, Squares, Rectangles and Rhombuses. Square, Rectangle and Rhombus are also as Parallelograms.


What are the uses of a ‘quadrilateral’ in sports?

Quadrilaterals are built to structurally support the soccer net. that is the purpose of these quadrilaterals. Such uses of quadrilaterals can be seen in many games.


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