Posted by lea on Friday, May 13, 2011 at 6:44am.
pi*D^2*L is the same for both.
Therefore D1^2*L1 = D2^2*L2
and D1^3 = 2D2^3
Therefore D2/D1 = 1.260
For the areas,
A1 = pi*D1^2/2 + pi*D1*L
= (3/2)pi*D1^2 since D1 = L1
A2 = pi*D2^2/2 + pi*D2*L2
= (5/2)pi*D2^2 since D2 = 2L2
A2/A1 = (5/3)*(D2/D1)^2
= (5/3)*1.5873 = 2.646
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