Investigate the formula for calculating the area of a circle using cereal O’s to measure everyday circular objects. This full lesson plan begins with a guided inquiry and then has students work in groups to investigate the relationship between a circle’s area and the area of a square with sides the length of the radius. In a class discussion, you’ll calculate pi by averaging the ratios of everyone’s measurements. Reflection and extension ideas are included.
This activity can either be an introduction to the formula for finding the area of a circle, or it can be used to help students develop a deeper understanding of the formula after they’ve learned it.
Prior to beginning this activity, students should know vocabulary for the basic parts of a circle, including circumference, center, diameter, and radius. They should be very familiar with the concept of area, understand that the area of a square is equal to the square of its sides, and have experience subdividing polygons into rectangles and triangles to develop formulas for area.
A full, free preview is available above to help you decide if this activity will be a good fit for your classroom.
This download is one pdf file that includes:
★Teacher Notes and scripted Lesson Plan
★2 Focus Questions pages
★3 Guided Investigation student pages
★Investigation Instructions Poster
★Blank Class Data Chart
★2 Extra Practice pages with answer keys
★1,000 Digits of Pi Poster
★Investigation Photos page
★My unique Collaborative License
, which grants you permission to share printed copies only
of this resource with up to four other members of your regular teaching team! (If you’d like to share the digital file, please return to your My Purchases
for more information.)
VA SOL 6.10b (2009)
VA SOL 6.7 a,b (2016)
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