A rectangular metal piece length 12cm and breadth 4cm is folded to form a cylinder find it's surface area
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When the rectangular piece is folded it must be folded along its length.
Such that height of the cylinder=Length of the rectangle=12cm.
Breadth =radius =4cm.
T. S. A=2πr(r+h) =2×22/7×4(4+12) =2×22/7×64=402.28cm^2
C. S. A=2πrh=2×22/7×4×12=301.17cm^2
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