Why Are Manhole Covers Round?

This Why Are Manhole Covers Round? video also includes:

Discover the peculiar geometric property of the curve of constant width, the Reuleaux triangle, and their intriguing connection to manhole covers with yet another fascinating TED-Ed video. 

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CCSS: Adaptable
Instructional Ideas

  • Consider having some manipulatives or three-dimenstional objects on hand in order to further demonstrate the concepts being discussed
Classroom Considerations

  • Pupils should have a strong understanding of several geometry concepts, such as pi, the points of a triangle, and calculating the area and perimeter of all geometric shapes, prior to beginning this video
Pros

  • Illustrations and animations help to explain the geometry concepts
  • Includes customizable online assessment, additional resources, and discussion questions
Cons

  • Speaker moves very fast through the material; it will be important to pause at several points in order to clarify concepts and answer questions