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Free Online 9th Class Maths Solutions - Chapter 11 – Circle – Part 1

9th Class Maths Solutions - Chapter 11 – Circle – Part 1

The permanent tip is called the centre and the stable distance is called the radius of the circle.
A circle with centre O and radius r is denoted by C (O,r).
A circle is the locus of a point which moves in a plane in such a way that its distance from a given fixed point is always constant.
Terms Related to a Circle
Radius : A Line segment joining the centre and a point on the circle is called its radius.
Class 9 Maths NCERT Solutions - Chapter 11 - Circles Takshilalearning, Maths NCERT Solutions Class 9, Class 9 Maths, NCERT Solutions for Class 9 Maths
The Plural of Radius is radii.
In the given figure, OA and OB are radii of circle C (O, r)
Circumference : The perimeter of a circle is called its circumference.
Circumference = 2πr.
Chord-A chord of a circle is a line segment joining any two points on the circle.
In the given figure, PQ, RS, and AOB are the chords of a circle with centre O.
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