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एक वृत्त से 56° के कोण पर काटे गये त्रिज्यखण्ड का क्षेत्रफल 4.4 सेमी2 है। वृत्त की त्रिज्या ज्ञात कीजिए।

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माना, वृत्त की त्रिज्या = r सेमी

तथा त्रिज्यखण्ड का कोण θ = 56°

तब, प्रश्नानुसार, 

त्रिज्यखण्ड का  क्षेत्रफल = 4.4 सेमी2

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