SOLUTION: I have the formula for area for a circle, but no matter how many times I have tried I cannot get the correct answer. The answer is in the back of my book to check it, but I'm just

Algebra ->  Formulas -> SOLUTION: I have the formula for area for a circle, but no matter how many times I have tried I cannot get the correct answer. The answer is in the back of my book to check it, but I'm just      Log On


   

Question 4533: I have the formula for area for a circle, but no matter how many times I have tried I cannot get the correct answer. The answer is in the back of my book to check it, but I'm just not seeing how they are coming up with it. Please show me how to get the answer by example. Here is the problem: The diameter of the base of a pie is 9 inches. The diameter of the top of the pie tin is 12 inches. How many square inches of crust need to be prepared in order to create a crust on the bottom and top but not on the sides of a pie made in this tin? Thanks for your help.
Found 2 solutions by longjonsilver, cleomenius:
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
ok...2 circles with radii 4.5 and 6 inches.

area of circle = pi%2Ar%5E2

so, area 1 = pi%2A4.5%5E2 and so, area 2 = pi%2A6%5E2

these, together are 20.25pi+%2B+36pi --> 56.25pi inches^2

Using the calculater, this is 176.71 inches^2. Hopefully, this is the answer in your book? If not, there is a typo in your book :-)

jon.

Answer by cleomenius(959) About Me  (Show Source):
You can put this solution on YOUR website!
Did you state the problem correctly?
Is sounds more like the pizza is shaped like a trapezpoid.
Cleomenius.