You are here
![Concyclic Points - Making 4 points concyclic [with Video] - Teachoo - Concyclicity of Points and Cyclic Quadrilateral](https://cdn.teachoo.com/d06da546-61d5-4dda-ae25-6a0625096921/slide78.jpg)
Proof is here Theorem 10 - Chapter 5 Class 9 – Ganita Manjari Part 1
Concyclicity of Points
Last updated at May 26, 2026 by Teachoo
Concyclicity of Points and Cyclic Quadrilateral
Class 9
Chapter 5 Class 9 - I’m Up and Down, and Round and Round (Ganita Manja
- Definitions
- Symmetries of Circle
- Number of Circles
- Exercise Set 5.1
- Think, Draw and Infer (Page 98)
- Angle Subtended by Chords
- Exercise Set 5.2
- Mid-points and Perpendicular Bisectors of Chords
- Exercise Set 5.3
- Distance of Chords from the Centre
- Exercise Set 5.4
- Distance of unequal chords from center
- Exercise Set 5.5
- Angle subtended by an arc
- Exercise Set 5.6
-
Concyclicity of Points and Cyclic Quadrilateral
- Theorems (and their Proofs)
- End-of-Chapter Exercises
Transcript
Concyclicity of Points What are Concyclic Points? Any 3 points (like A, B, and C) will always perfectly form a circle. But getting a 4th point to land exactly on that same circle is special! When 4 or more points lie on the exact same circle, we call them concyclic points How to make 4 points concyclic? We are given a Theorem for this Theorem 10: If a line segment AB joining two points A, B subtends equal angles at two other points C, D that lie on the same side of AB, then the four points lie on a circle. Let’s look at the proof Proof is here Theorem 10 - Chapter 5 Class 9 – Ganita Manjari Part 1
