I have to write here as well apparently, but have added answer as picture
$15.41
Multiply the $1.79 by 4 which gets you $7.16. Then, add the $7.16 to the $8.25 and that gets you $15.41.
(-1,10), (2,1) , (0,7), (-2,1)
C = (pi)(d)
C = 3.14 * 2
C = 6.28 <==