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3. Example 1 - Circumference of a circle

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Last updated 26 October 2012 15:30 by NZTecAdmin
  • Ask every learner to find a different circular object in the room (top of a glass, bottom of glass, cups, white board marker, etc) and measure the distance around it (circumference).
  • Measure the distance across it, going through the centre point (diameter).
  • Record all of the measurements in a table



  • Ask the learners to explore the relationship between circumference and diameter: the circumference is about 3 times bigger than the diameter no matter what size the circle is.
  • How could we work out the circumference if we only measure the diameter?
    • C 3 x D
    • We’ve derived a formula for circumference



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