The surface area of hollow cylinder with radius 'r and height 'h' is measured by-

The surface area of hollow cylinder with radius 'r and height 'h' is measured by- Correct Answer 2πrh

ফাঁপা সিলিন্ডারের বক্রতলের ক্ষেত্রফল ভূমির পরিধী × উচ্চতা = 2πr×h = 2πrh
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