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21 सेमी त्रिज्या वाले एक वृत्त से एक त्रिज्यखण्ड काटा जाता है। त्रिज्यखण्ड का कोण 150° है। चाप की लम्बाई तथा क्षेत्रफल ज्ञात कीजिए।

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वृत्त की त्रिज्या r = 21 सेमी तथा त्रिज्यखण्ड का कोण θ = 150°, चाप को लम्बाई l सेमी है।

अतः चाप की लम्बाई 55 सेमी तथा क्षेत्रफल = 577.5 सेमी2

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