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प्रश्न
The given figure shows a circle with centre O such that chord RS is parallel to chord QT, angle PRT = 20° and angle POQ = 100°. Calculate:
(ii) angle QRP
उत्तर
Join PQ, RQ and ST.
Arc QP subtends `∠`QOPat the centre and `∠`QRP at the remaining part of the circle.
∴ `∠QRP = 1/2 ∠QOP`
⇒ `∠QRP = 1/2 xx 100° = 50°`
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