Question

area lateral e area total de um cilindo com 3m de altura, e 4m de comprimento.

Answer 1

$A_{lateral}=C_{base}*h$
$A_{total}=A_{lateral}+2*A_{base}$
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$C_{base}=4m$
$2*\pi*r=4$
$r=4/(2\pi)$
$r=(2/\pi)m$

$A_{lateral}=C_{base}*h$
$A_{lateral}=4*3$
$A_{lateral}=12m^{2}$

$A_{base}=\pi*r^{2}$
$A_{base}=\pi*(2/\pi)^{2}$
$A_{base}=\pi*4/(\pi^{2})$
$A_{base}=(4/\pi)m^{2}$

$A_{total}=A_{lateral}+2*A_{base}$
$A_{total}=12+2*(4/\pi)$
$A_{total}=12+(8/\pi)$
$A_{total}=[(12\pi+8)/\pi]m^{2}$