Mathematics · Mensuration
एक खोखले बेलनाकार पाइप की बाहरी त्रिज्या 7 सेमी, आंतरिक त्रिज्या 6 सेमी और ऊंचाई 20 सेमी है। पाइप का कुल पृष्ठीय क्षेत्रफल (दोनों सिरों को मिलाकर) ज्ञात कीजिए। (π = 227 का प्रयोग कीजिए)
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