# Pizza Math. (Lesson)

Technology & Learning, November 2002 | Go to article overview

# Pizza Math. (Lesson)

Subject Area: Mathematics

Software: ImagiGraph (ImagiWorks, Inc)--www.imagiworks.com

Technology Needed: Palm handheld computer

Lesson Description: Students learn to plot equations on a graph to determine the solution to a problem.

Objectives: Students understand how mathematics helps them to visualize answers to real-world problems. Students demonstrate an understanding of mathematics, writing equations, and graphing. Students will become familiar with radius and diameter

Vocabulary: circle, circumference, radius, diameter, pi

Lesson Starter

1. You and your friends go to a pizza place and you're all really hungry so you definitely want a large sized pizza. Today they're offering two choices for how to pay for what you order. The first option is to pay 30 cents per inch of the pizza's circumference. The second option is to pay 10 cents per square inch of the area. Which is the better bargain? Is there ever a time when you pay the same no matter which option you choose?

2. What's the formula for the circumference of a circle? (Answer: Pi*d or Pi*2r)

3. What's the formula for the area of a circle? (Answer: Pi*[r.sup.2])

4. What formula would you use to determine the pizza's cost using the first option?

Answer: Multiply the circumference by the cost per inch. The formula is .30 * (Pi*d) or .30 * (Pi*2r).

5. What formula would you use to determine the pizza's cost using the second option?

Answer: Multiply the area by the cost per square inch. The formula is .10 * (Pi*[r.sup.2])

Graph It

1. Let's visualize the solution by graphing these formulas. Turn on your Palm handheld computer and click on ImagiGraph. …

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