Question 944708
Fence needed for two radii and the arc corresponding to 80 degrees.


{{{pi*r^2=121pi}}}
{{{r^2=121}}}
{{{r=11}}}



The arc length,
{{{2pi*11(8/36)}}}
{{{11*8*pi/18}}}
{{{11*4*pi/9}}}


Total fence needed is {{{highlight(2*11+44pi/9)}}}.