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.
| Circles |
| Geometry |
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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