Geometry check my answer?
posted by Skye .
Small Pizza radius 6 in. cost $9.75
Medium radius 8in cost $12
Largediameter 20 in cost $16.50
The edge is stuffed with cheese, and its the best part of the pizza/ What size has the most pizza edge pr dollar? what is the circumference of this pizza?

so i find the area of all the pizza, how do i find the cost per slice? per dollar?
Small area 113.04
Medium area200.96
Large area 314
what do i do next? Thanks :)

It is edge (or circumference) per dollar you want, not area in this case
so divide each circumference by the cost to find the edge per dollar.
(I do not agree that the edge is the best, but so be it) 
1.
C = pi * d
C = 3.14 * 12
C = 37.68
9.75 / 37.68 = $0.259 per per inch
Follow the same procedure for the medium and large pizzas to find the cost per inch of circumference.
2. Into how many pieces will you divide each pizza? 
medium $0.238
large $0.262
Then what do i do? I am kind of very confused. 
What is the surface area with a dimeter of 40mm and the height is 16mm?