Revision Notes For CBSE Class 9 Math Chapter -10 Circles

In geometry, a circle is defined as a closed figure with a set of points in a plane at a specific distance from the centre. It is divided into two parts: an interior and an exterior.

The area of a circle is calculated by the given formulae: A = π r2

Where: A is the Area and r is the radius.

The properties of the circle are:

  • The line passing through the centre of a circle is called a Diameter.
  • The distance around the circle is called the Circumference.
  • The distance from the centre to the circumference of a circle is called the Radius.

Notes about Class 9 Chapter 10 Maths-Circles is found below:

CBSE Class 9 Maths Chapter 10-Circles 

For more information about the Circles, click on the below-mentioned links.

Frequently asked Questions on CBSE Class 9 Maths Notes Chapter 10: Circles

What is the definition of ‘Diameter’?

In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

What is a ‘Cyclic quadrilateral’?

A cyclic quadrilateral is a quadrilateral drawn inside a circle. Every corner of the quadrilateral should touch the circumference of the circle.

What is the meaning of a ‘Segment’?

A segment refers to any of the parts into which a thing is divided or naturally separates.

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