Circles – Notes
Basic Concept of A Circle
The collection of all the points in a plane that are at equal distance from a given fixed point in the plane is called a circle.
A line segment joining the centre of a circle with any point on its circumference is called the radius of a circle.
A lines that joins two points on the circumference of the circle is a called a chord.
A chord that passes through the centre of circle is called the diameter of a circle.
Diameter = 2 Radius
The part of the circumference of circle between two given points is called an arc.
The region between two radii of the circle and any of the arcs between them is called a sector.
CBSE Class 9th Maths 10 - Circles - Notes