Two chords AB and CD of a circle with centre O intersect each other at the point P. If ∠AOD = 20o and ∠BOC = 30o. Then ∠BPC is equal to- O केन्द्र वाले वृत्त की दो जीवायें AB तथा CD एक दूसरे को बिन्दू P पर प्रतिच्छेदित करती है। यदि ∠AOD = 20o और ∠BOC = 30o तब ∠BPC बराबर है-

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