# Approximate Area and Circumference of a Circle Using Isosceles Triangles

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This Demonstration shows a unit circle and many isosceles triangles. As you increase the number of triangles, you can see that the sum of their bases approximates the circumference of the circle and the sum of their areas approximates the area of the circle.

Contributed by: Xiang Li (April 2011)

Open content licensed under CC BY-NC-SA