If the height of a cylinder becomes 
of the original height and the radius is doubled, then which of the following is true?
according to the question,
The total surface area of cylinder having radius (r) and the height(h).
Total surface area of cylinder = 2πr(h + r)
And the new total surface area of cylinder having radius(2r) and the height (
).
= 2π (2r)[2r + 
h]
= πr(8r + h)
8