1. Investigation 7.1 Pricing Pizza Tenika Earline Lisa Byron

2. There are four measurements that are useful for describing the size of a circle: Diameter Radius Circumference Area

3. Diameter The diameter cuts the pizza into two equal halves.

4. Radius The radius is half of the diameter –It goes from the center of the pizza to the crust.

5. Circumference The circumference is the crust of the pizza. Circumference means perimeter in the language of circles.

6. Area The area of a circle is the number of square units inside that circle. The toppings on the pizza

7. Problem 7.1 The Sole D’ Italian Pizzeria sells small, medium, and large pizzas. A small pizza is 9 inches in diameter, a medium is 12 inches in diameter, and a large is 15 inches in diameter. Prices for cheese pizza are $6.00 for a small, $9.00 for a medium, and $12.00 for a large.

8. Problem 7.1 Continued A.Draw a 9 –inch, a 12-inch, and a 15-inch “pizza” on centimeter grid paper. Let 1 centimeter of the grid paper represent 1 inch on the pizza. Estimate the radius, circumference, and area of the pizza. (You may want to use string to help you find the circumference.)

9. Collecting Data SizeDiameterRadiusCircumferenceArea Small Medium Large

10. Collecting Data SizeDiameterRadiusCircumferenceArea Small9 inches4.5 inches 28.3 inches 63.6 inches 2 Medium12 inches6 inches 37.7 inches 113.1 inches 2 Large15 inches7.5 inches 47.1 inches 176.7 inches 2

11. Problem 7.1 Continued B.Which measurement – radius, diameter, circumference, or area – seems most closely related to price? Explain your answer.

12. Reference: Teachertube.com- HomeAlonevideo

13. ACE Problems Bring in circular objects to use in the next problems