by working out how many times the radius goes around the circle and dividing by two. hard to do, better off just knowing it It has been proven that Pi is an irrational number. This means it cannot be expressed exactly, it simply goes on for ever. It has been calculated 10 over a trillion decimel plces but it will never end
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In ancient Babylonian and Biblical times the value of pi was considered to be about 3
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It takes a lot of concentration and free time to calculate the billionth digit of pi. The billionth digit of pi is nine.
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Srinivasa Ramanujan.