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Can you tell me some interesting facts on circles.

Few interesting facts on circles are:

1) The ratio of its circumference to its diameter is a constant and is approximately equal to 3.14. This constant is an irrational number and is denoted by the Greek letter π (pi).

2) For any given area, out of all the closed shapes, circles have the minimum possible perimeter.

3) For any given perimeter, out of all the closed shapes, circles have the maximum possible area.

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