A rectangular sheet of dimensions 44 cm x 7 cm is rotated about its longer side. Find the volume and the total surface area of the solid thus generated.
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rectangular sheet dimension :- 44cm × 7cm
rotated about its longer side --> cylinder is formed with circumference of its base = 44cm and height = 7cm
2πr = 44
r = 7cm approximately
total surface area = 2πrh + 2πr²
44 × 7 + 2π × 7²
=615.87cm²
volume = πr²h
= π × 7² ×7
= 1077.56cm³
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