Question 154877
a) get the {{{Area}}} of the Outer Radius={{{R}}} + Inner radius={{{r}}}
Remember: {{{A=pi(R^2)+pi(r^2)=pi(R^2+r^2)}}}
So, {{{A=pi(10^2+3^2)=pi(100+9)}}}
{{{A=109pi(in^2)}}}={{{342.4336in^2}}}
b){{{Rate=Price/area}}}*{{{Area}}}
{{{(7.50/cross(in^2))*(342.4336cross(in^2))}}}
$2568.252 ---------------------> cost to make it
Thank you,
Jojo