- #1

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## Main Question or Discussion Point

ok why does

surface area = ( y) ( 1+ f ' (x)^(2) )^(1/2)

equal

surface area = (x ) (1+ f ' (x)^(2) )^(1/2)

the simplest explanation please.

surface area = ( y) ( 1+ f ' (x)^(2) )^(1/2)

equal

surface area = (x ) (1+ f ' (x)^(2) )^(1/2)

the simplest explanation please.