When all of the linear dimensions are doubled . . .
-- the perimeter is also doubled
-- the area is multiplied by 22 = 4.
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The volume increases by 8 times (23). doubling is 2, so its 2 to the power of 3. Leigh
They both have the same effect on the surface area of the pipe, but the radius has more effect on its volume/capacity.
You would also double the perimeter.
Since the perimeter is a linear measure it is also doubled.
If the side is 11 then the perimeter is 44.The altitude is irrelevant. It can be anything less than 11, with no effect on the perimeter.