Answer:
Area of a circle=πr^2
12 inch pizza
π(6^2)≈113.04in^2
15 inch pizza
π(7.5^2)≈176.625in^2
Now we turn this into a fraction, and solve the problem:
113.04/10.99=176.625/x
113.04x=1941.10875 <-------Division property of equality
x=17.171875.
The cost of a 15 inch diameter pizza is $17.17
Hope this helped.