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What is the diameter of a 10 inch pizza?
10 inches
What is the area of a 16 inch pizza?
In a short time interval its pi * r2 = pi * 64 = 201 in2. In a longer time interval there is no such thing as a 16 inch pizza because it would be rapidly eaten.
Which is better deal 2 8 inches pizza for 10.99 or one 12 inches pizza for 9.99?
1 12 inch pizza for 9.99 is the better deal. Whether or not we consider the total volume of pizza purchased or just the surface area of pizza (which reflects how much topping there will be) the proportion between the 12 inch and the two 8 inch pizzas (combined) always results in 9:8. So you are getting slightly more pizza with the 12 inch pizza, and it is cheaper, so it is the better deal. Volume = pi * r2 * h. As r2 for the 12 inch pizza = 62 = 36, this is more than 2 * 42 = 32 by the proportion 36:32, which simplifies to 9:8.
If a pizzeria offers a 9 inch diameter pizza for 12 and a 18 inch diameter for 24. Are both offerings equally economical?
No because there are about 64 square inches in the 9 inch pizza and about 254 square inches in the 18 inch pizza.
How many more square inches are in a 14-inch pizza than in a 12-inch pizza?
2
