Lesson plan

Finding the area of a circle by using a formula

teaches Common Core State Standards CCSS.Math.Content.7.G.B.4 http://corestandards.org/Math/Content/7/G/B/4
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: The area of a circle can be found using the radius or diameter The area of a circle can be found by using a formula This lesson builds on student understanding of circles. Students explore the idea that a circle can be cut into congruent pieces which can be rearranged to make a rectangular-like shape. The task then has students use a value for radius to find the area of the circle by finding the area of the rectangular-like shape. Students are then asked to generalize this formula using variables and apply this formula in another context. Vocabulary: radius, diameter, pi, area, circumference Special Materials: Scissors (optional) Compass (optional) Rulers (optional)