Illuminations: Discovering the Area Formula for Circles

Using a circle that has been divided into congruent sectors, students will discover the area formula by using their knowledge of parallelograms.

Students will then calculate the area of various flat circular objects that they have brought to school. Finally, students will investigate various strategies for estimating the area of circles.

 

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Geometry
Middle School, Educator

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Illuminations (National Council of Teachers of Mathematics)

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