# Notes Class 9 Mathematics Chapter 10 Circles

Please refer to Circles Class 9 Mathematics Notes and important questions below. The Class 9 Mathematics Chapter wise notes have been prepared based on the latest syllabus issued for the current academic year by CBSE. Students should revise these notes and go through important Class 9 Mathematics examination questions given below to obtain better marks in exams

## Circles Class 9 Mathematics Notes and Questions

The below Class 9 Circles notes have been designed by expert Mathematics teachers. These will help you a lot to understand all the important topics given in your NCERT Class 9 Mathematics textbook.

Refer to Chapter 10 Circles Notes below which have been designed as per the latest syllabus issued by CBSE and will be very useful for upcoming examinations to help clear your concepts and get better marks in examinations.

• Circles and its Related Terms : A Review
•  Perpendicular from the Centre to a Chord
•  Circle through Three Points
• Equal Chords and their Distances from the Centre
•  Angle Subtended by an Arc of a Circle
• Circle- circle is locus of such points which are at equidistant from a fixed point in a plane.
•  Concentric circle- Circle having same centre called concentric circle.
• Two arc of a circle called congruent if they have the same degree measure.
• If two arc equal then their corresponding chords are equal.
• The perpendicular from centre to chord of circle, it bisects the chord and converse.
• There is one and only one circle passing through three non-collinear points.
•  Equal chords of circle are equidistant from centre.
• · The angle subtend by an arc at the centre of circle is twice the angle which subtend at remaining part of circumference.
• · Any two angles in the same segment of the circle are equal.
· Angle of semicircle is right angle.
• Equal chords of circle subtend equals angle at the centre of circle.
•  If the all vertices of a quadrilateral lie on the circumference of circle, then quadrilateral called cyclic.
•  In a cycle quadrilateral the sum of opposite angles is 180o and converse.
•  The exterior angle of a cycle quadrilateral is equal to the opposite interior angle.