Math Curriculum
Level D
Unit: Geometry
Key Lesson 7.3.8 Relating Area to Circumference
Lesson topic: Area of a circle
Instructor Materials
- Teacher guide
- Slides
- Practice Problems resource
- CCRS standard: 7.G.4
- Learning goal: Generalize a process for finding the area of a circle, and justify (orally) why this can be abstracted as πr2. Show how a circle can be decomposed and rearranged to approximate a polygon, and justify (orally and in writing) that the area of this polygon is equal to half of the circle’s circumference multiplied by its radius.
- 7.3 Assessment and Practice Problems
Student Materials
Related Lessons
Preparation
If students need additional lessons before this key lesson, use these supplemental lessons.
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2. Adaptations and updates to IM K-5 Math are copyrighted 2019 by Illustrative Mathematics®, and are licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).
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