Posted by Lori on Sunday, March 28, 2010 at 10:08pm.
A 7 inch pizza cost $8 and a 14 inch pizza costs $20. Tommy says the smaller pizza is a better buy because the larger pizza is twice as big and more than twice as expensive. Do you agree with his reasoning? Explain why or why not.

Math 157  Ms. Sue, Sunday, March 28, 2010 at 10:16pm
Area of 7 inch pizza:
A = pi * r^2
A = 3.14 * 3.5 * 3.5
A = 38.465 square inches
8/38.465 = $0.21 per square inch
Follow the above procedure to find the area and cost per square inch of the larger pizza.

Math 157  Lori, Sunday, March 28, 2010 at 10:23pm
A = pi x r^2
A = 3.14 x 7 x7
A = 153.86
20/153.86 = $0.13 per square inch

Math 157  Ms. Sue, Sunday, March 28, 2010 at 10:29pm
Right! :)

Math 157  Lori, Sunday, March 28, 2010 at 10:44pm
Thank you!

Math 157  Ms. Sue, Sunday, March 28, 2010 at 10:48pm
You're welcome.
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