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Response to be spam : Pi can be calculated as close to perfectly as you want using various methods. Your measuring method is not one of them, though. Because you cannot measure precisely, your result will be inaccurate (you need to measure both the circle and the radius, and have a perfect circle).

One way to approximate pi is by modeling it as a regular polygon with infinite sides. Calculate the circumference of the polygon as the number of sides increase, and you can get as close as you like to pi.
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