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The Circumference of a Circle

How many times does the diameter fit around the circumference? Choose your number. 1. 1½ . 2. 2½ . 3 . 3½ . 4 . d. Diameter(d). Circumference (C). The Circumference of a Circle. 1. 2. In terms of the radius C = 2 πr. 3. It’s the same for all circles!. 4 Sectors.

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The Circumference of a Circle

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  1. How many times does the diameter fit around the circumference? Choose your number. 1 1½ 2 2½ 3 3½ 4 d Diameter(d) Circumference (C) The Circumference of a Circle 1 2 In terms of the radius C = 2πr 3

  2. It’s the same for all circles!

  3. 4 Sectors The Area of a Circle

  4. 8 Sectors

  5. 16 Sectors

  6. 32 Sectors

  7. As the number of sectors  , the transformed shape becomes more and more like a rectangle. Remember C = 2πr ½ C r What are the dimensions of this rectangle? What is its area in terms of the radius? A = πrx r = πr2

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