Mathematics · Mensuration
एक धातु का बेलनाकार पाइप 84 सेमी लंबा है। इसके अनुप्रस्थ काट का आंतरिक व्यास 6 सेमी और बाहरी व्यास 6.6 सेमी है। इसका आंतरिक वक्र पृष्ठीय क्षेत्रफल ज्ञात कीजिए।
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1584 सेमी2
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