Question 69356
Formula for area of a cone is {{{pi*r*sqrt(r^2+h^2)}}}

if h = 18 & r = 10 then:

{{{a = pi*10*sqrt(10^2+18^2)}}}
{{{a = pi*10*sqrt(100+324)}}}
{{{a = pi*10*sqrt(424)}}}
{{{a = pi*10*(20.59126028)}}}
{{{a = 646.8935203}}}{{{ft^2}}}