The Circumference of a Circle

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Presentation transcript:

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 1 2 Diameter(d) Circumference (C) In terms of the radius C = 2πr 3

It’s the same for all circles!

The Area of a Circle 4 Sectors

8 Sectors

16 Sectors

32 Sectors

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