a rectangular sheet of paper 44cmx20cmis rollef along its length to form a cylinder.find total surface area so formed
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Its folded along its length so its length will be circumference of the base
2 πr = 44
πr = 22
22/7 r = 22
r = 7 cm
height = 20 cm
curved surface area of cylinder =2 πrh
= 2 x 22/7 × 7 × 20
= 880 square cm
area of top and base of cylinder = 2 π * r2
= 2 x 22/7 x 7 x 7
= 308 square cm
total surface area = 880 + 308 = 1188 cm sq
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