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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

Diameter

Circumference

• 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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