Question

What will happen to total surface area of a cylinder if it’s radius is doubled

Answer 1

T. S. A of Cylinder
$= 2\pi \: r(r + h)$
If the radius is doubled,
T. S. A of Cylinder
$= 2\pi \: 2r(2r + h) \\ = 2(2\pi \: r(2r + h)).$



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