# Eventmath/Lesson plans/Medium versus large pizzas

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## Activities

* Begin by displaying the linked tweet above. Gain students attention by asking "Why was Roy requesting to call the owner? Were they so happy with the "extra" bit of pizza that they wanted to thank them? Was Roy unhappy?" Have students think-pair-share for a short period of time to get their initial thoughts. (Make sure to only display the first tweet - part 1/3). Perhaps use a polling system, like Kahoot!, to guage student reactions to the question.
* Proceed to identifying the goals of the lesson:
    At the end of this lesson, you will be able to...
** calculate the area of a circle given diameter
** analyze the relationship between diameter and area of a circle
* Activate student's prior knowledge about parts of circles (specifically diameter) by using diagrams of pizzas. Using the attached handout, have students label the diagrams by specifically asking the students "What part of the pizza (circle) does 5" refer to?" Also ask "What part of the pizza does 9" refer to?".
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