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संलग्न चित्र में एक समबाहु त्रिभुज ABC जोकि O केन्द्र तथा 4 सेमी त्रिज्या वाले वृत्त के अन्दर स्थित है। छायांकित क्षेत्र का क्षेत्रफल ज्ञात कीजिए।

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वृत्त की त्रिज्या r = 4 सेमी

∵ समबाहु A ABC का प्रत्येक कोण 60° है। अर्थात् ∠ABC = 60°

∴ केन्द्र O पर बना कोण AOC = 120°

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