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The Circumference of a Circle

Teaching Mathematics Visually and Actively. The Circumference of a Circle. Tandi Clausen-May. Click the mouse only when you see a. Otherwise you will miss the animations!. Click the mouse now!. The circumference. of a circle. First we need  (pi). Is it…..

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The Circumference of a Circle

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  1. Teaching Mathematics Visually and Actively The Circumferenceof a Circle Tandi Clausen-May

  2. Click the mouse only when you see a Otherwise you will miss the animations! Click the mouse now!

  3. The circumference of a circle

  4. First we need  (pi) Is it….. 3.1415926535897932384626433832 795028841971693993751058209749 445923078164062862089986280348 253421170679821480865132823066 470938446095505822172…...? What is? Is it a number?

  5. Well… not exactly.  is a ratio.

  6. Pi is the number of times you must travel straight across the circle to go the same distance as all the way round the circle. Click to see the paths once across twice across three times across and a bit further! So  is a bit more than 3.

  7. How can we be sure that  is a bitmore than 3? 3 2 1 For a regular hexagon, the distance all the way round is exactly 3 times the distance straight across the middle. Click to see the paths

  8. And all the way round the circle is a little bit more than all the way round the hexagon. So all the way round the circle is a little bit more than 3 times straight across the middle. Click to see the paths Circumference =× Diameter

  9. Summary Circumference = 3 2 1 times the diameter Click to see the paths …and a little bit more Circumference =× Diameter

  10. Find it at http://www.uk.sagepub.com Now watch PP 10-2: The Area of a Circlefrom the CD insideTeaching Mathematics Visually and Actively Tandi Clausen-May

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