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By: Tracy Balow & Kristen Moorhouse

Pizza, Pizza!. By: Tracy Balow & Kristen Moorhouse. Which is the better buy?. 12 inch thin crust pizza for $10.99. 9 inch thin crust pizza for $7.99. To solve this problem, which concept will you need to use?. a) the circumference of a circle. OR. b) the area of a circle.

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By: Tracy Balow & Kristen Moorhouse

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  1. Pizza, Pizza! By: Tracy Balow & Kristen Moorhouse

  2. Which is the better buy? 12 inch thin crust pizza for $10.99 9 inch thin crust pizza for $7.99

  3. To solve this problem, which concept will you need to use? a) thecircumferenceof a circle OR b)theareaof a circle Think, pair, share…

  4. Try again! Circumference refers to the distance around a circle. You would use circumference if you only wanted to eat the crust. Click on the pizza to continue.

  5. Correct! Area refers to the region contained by the whole pizza. You would use area to find out how much pizza there is!

  6. Now… can you write the formula to find the area of a circle? A = πr2 Think, pair, share…

  7. 12” pizza A = πr2 A = 3.14(6)2 A = 3.14(36) A = 113.04 in2 9” pizza A = πr2 A = 3.14(4.5)2 A = 3.14(20.25) A = 63.59 in2 Now, find the area of each pizza.Round to the nearest hundredth. Remember the radius is half the diameter! Think, pair, share…

  8. Now, how can we use that information to find the better buy? Recall, to find the better buy, you need to find the price per oneunit (the unit rate!). Soooooo, take the price and divide it by the area of the pizza. This will give you the price per square inch of pizza! Do this for both pizzas so you can compare their unit prices. Vs. Think, pair, share…

  9. 12” pizza $10.99 113.04 in2 = 0.0972 = $0.10/in2 9” pizza $7.99 63.59 in2 = 0.1256 = $0.13/in2 Now, find the unit rate of each pizza.Round to the nearest hundredth. Think, pair, share… Vs.

  10. So, after doing all that work and getting all those answers… Which pizza is the better buy? Why? Explain. And…. Think, pair, share…

  11. What did the original question ask? What vocabulary did we need to know? What information did we need to know to solve the problem? How did we solve the problem? What were the steps? How can we check our answer? What standards were addressed? Let’s review….

  12. Finally…. How would you solve this same problem if the pizzas had different thicknesses? Explain. How would you solve this same problem if the pizzas were square? Explain. Think, pair, share…

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