Question 1116661
The circumference and perimeter are neither given.


pool circumference  {{{2pi*r}}}
pool radius r



Charlie wants fence to be around circular region of radius  r+4, so the amount of extra fencing he needs now is:


{{{highlight(2pi(r+4)-2pi*r)}}}

-

{{{2pi*r+8pi-2pi*r}}}

{{{8pi}}}---------25.12, OR, 25.13----------------------------------?