Updated
new NCERT Book
- 2026 Exams.
In Chapter 9 Class 9 of NCERT, Circles, Theorems are extremely important, we have provided detailed explanation of the
theorems of circles
as well as
NCERT Solutions
of all questions and examples.
In this chapter, we will learn
-
The
basics
- What is a circle, radius, diameter, arc, sector, segment, chord
-
Then, we do some theorems, and related questions... like
-
Equal chords subtends
equal angle at the center, and its converse
-
Perpendicular from center
to a chord bisects the chord, and its converse
-
Only 1 Circle can pass through
3 non-collinear
points
-
Equal chords subtend equal angles at the center, and its converse
-
Angle subtended by an arc is double the angle subteneded at any other point
-
Angles in the same segment of a circle are equal
-
Then, we will learn what a Cyclic Quadrilateral is,
-
And its property - Sum of opposite angles of cyclic quadrilateral is 180
In addition to this, we have solved all the NCERT questions of this chapter, including Extra questions (Ex 10.6 - Optional Exercise)
Click on a link below to start doing the chapter