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Proof is here Theorem: Angle in a semicircle is a right angle - Chapter 5 Class 9 – Ganita Manjari Part 1
Angle subtended by the Diameter
Last updated at May 26, 2026 by Teachoo
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
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Angle subtended by an arc
- Exercise Set 5.6
- Concyclicity of Points and Cyclic Quadrilateral
- Theorems (and their Proofs)
- End-of-Chapter Exercises
Transcript
Angle subtended by the Diameter Another result which we have is Angle in a semicircle is 90° Or Angle made by Diameter is 90° We can write this in two ways Any angle drawn inside a perfect semicircle will always be exactly 90° (a right angle). Or Diameter is a chord passing through the center. The Angle made by the diameter at any point on the circle is 90° Another example could be like this Let’s look at the proof Proof is here Theorem: Angle in a semicircle is a right angle - Chapter 5 Class 9 – Ganita Manjari Part 1
