Informal Proofs of the Circumference/Area of a Circle

This Informal Proofs of the Circumference/Area of a Circle lesson plan also includes:

Use this lesson plan to help your geometers develop informal proofs of the circumference and area of a circle. Working in small groups, learners rotate between three stations to complete hands-on activities that illustrate the relationships in the circumference and area formulas. The station activities include dissecting a paper plate, rolling a can to measure its circumference, and an exploration of relationships using an online circle tool applet. A reflection sheet is provided for each learner to record observations and information about each station's activity. The lesson concludes with learners using their notes to individually write an informal argument for the circumference and area of a circle.

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CCSS: Designed
Pros

  • Lesson plan has detailed notes and is easy to follow
  • Good use of hands-on activities
  • Includes a good follow-up homework assignment
Cons

  • Requires access to several laptops or tablets