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Coins in a Circle

by Danny Whittaker


Act One

Act Two

  • Teacher note
    Actually, the size of the coin is not really as important in this stage as in the sequel later on.

    • Diameter of a 10-cent Singapore coin = 18.5 mm

    • Diameter of black rug = 22 inches

    Method is to have students used various sizes of circles and work out how many coins will fit into these sizes, then build a quadratic model for the data. Building the model can be done using a spreadsheet program or any other process, but the hope is that students recognize that the data is NOT linear.
  • ImageCoin is 18.5mm = 0.728 inches
  • ImageRug is 22 in = 558.8 mm

Act Three

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