Showing is better than telling in a short demonstration video to find the area of a circle. The silent narrator transforms the circle, made from ball chain, into a triangle you can measure with a ruler, labeling quantities each step of the way for clarity.

Concepts

proofs, area of circles, circles, triangles

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Additional Tags

science

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Instructional Ideas

• Provide pupils with ball chain and a ruler so they can do the proof themselves

Classroom Considerations

• The lack of verbal instructions may make the video hard to follow for auditory learners
• Students should have prior knowledge of circles, triangles, and related measurement terms

• This video is hosted on YouTube

Pros

• Tactile learners appreciate the opportunity to feel their way through a problem, which is sometimes difficult to orchestrate in a math class
• The content provides an alternate way of viewing and executing geometric proofs

Cons

• None