Lesson plan

7. Find area given radius/diameter (FP)

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.Content.7.NS.A.3 http://corestandards.org/Math/Content/7/NS/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8
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Lesson objective: Compute the area of a circle when given the radius or diameter of a circle.

This lesson helps to build procedural skill with the formulas for the area of a circle. Real world examples are used here because it supports the relationship between the area and radius of a circle. This work develops students' understanding that circles have area like any other two dimensional shape.

Students engage in Mathematical Practice #8 (Look for and express regularity in repeated reasoning) as they use real world situations to explore the connection between the radius of a circle and its area.

Key vocabulary:

  • area
  • diameter
  • radius
  • pi (π)

Special materials needed:

  • none