त्रिज्या 2.1सेमी वाले एक वृत्ताकार क्षेत्र का क्षेत्रफल ज्ञात कीजिये?
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Answer:
πr^2=22/7×2.1×2.1,
=22/7×21/10×21/10,
=693/50,
=13.86cm^2
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