I'm horrible at maths but I think the solution is finding the surface area of both slices, which could be something along the lines of S(1) = π*36*60/360 and S(2) = π*49*45/360. Then you just have to find the price of inch² per dollar, which can be done easily by cross multiplication. That's what I think, anyway. My math skills aren't the best around, though, so don't take this too seriously. Try it if you want, I'm too lazy and tired.
Pi*R^2 is the area of a circle, where R is the radius, so...
Pizza area is 3.14*7*7 / 8 = 19.23in^2 in the case of the $1.70 slice; which is 11.3in^2 per $1
Pizza area is 3.14*6*6 / 6 = 18.84in^2 in the case of the $1.50 slice; which is 12.56in^2 per $1.
You get more pizza for the slice that is $1.50
Pizza area is 3.14*7*7 / 8 = 19.23in^2 in the case of the $1.70 slice; which is 11.3in^2 per $1
Pizza area is 3.14*6*6 / 6 = 18.84in^2 in the case of the $1.50 slice; which is 12.56in^2 per $1.
You get more pizza for the slice that is $1.50
Proving a wide 6 inches is better than a slender 7 inches
ifyouknowwhatimean