Section 8.2: Surface Area (of Revolution)
Open Cylinder
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$A = 2 \pi y \Delta x$
Cone
//INSERT IMAGE
$A = 2 \pi y \ell x$
$= \pi r \ell$
Open Cylinder
//INSERT IMAGE
$A = 2 \pi y \Delta x$
Cone
//INSERT IMAGE
$A = 2 \pi y \ell x$
$= \pi r \ell$