Posted by Simon on Tuesday, February 5, 2013 at 11:01am.
a = 2pi*r*h
a' = 2pi(2/3 r)(4/7 h) = 2pi*rh*8/21
a:a' = 1:8/21 = 21:8
Note that the ratio is just the product of the linear ratios.
Thank you
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