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Ex 9.1, 1 - Chapter 9 Class 9 Circles
Last updated at August 11, 2026 by Teachoo
Angle subtended by chord at a point
Chapter 9 Class 9 Circles
Concept wise
- Terms and definations
-
Angle subtended by chord at a point
- Circle through 3 points
- Equal chords and their distance from centre
- Angle subtended by arc at the centre
- Cyclic quadrilaterals
Transcript
Ex 9.1, 1 Recall that two circles are congruent if they have the same radii. Prove that equal chords of congruent circles subtend equal angles at their centres. Given: Two congruent circles C1 & C2 AB is the chord of C1 & PQ is the chord of C2 AB = PQ To prove: Angle subtended by chords are equal i.e. AOB = PXQ Proof: In AOB & PXQ AO = PX BO = QX AB = PQ AOB PXQ AOB = PXQ
