Different people found better and better approximations. The exact value can only be expressed as the symbol for pi; it has been proven that pi is irrational, in other words, you can't write it exactly as a fraction with integers in the numerator and the denominator. Therefore, you might say that nobody found the exact value of pi, and nobody ever will.
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Just divide 56 by pi. Pi is approximate 3.14; or use the "pi" key on your scientific calculator.Just divide 56 by pi. Pi is approximate 3.14; or use the "pi" key on your scientific calculator.Just divide 56 by pi. Pi is approximate 3.14; or use the "pi" key on your scientific calculator.Just divide 56 by pi. Pi is approximate 3.14; or use the "pi" key on your scientific calculator.
If you want an approximate answer, you can measure it with string. If you want an exact answer and know the radius, multiply by 2*pi to find the circumference.
If pi=3.14, then the circumference is ( 3.14 times the diameter).
People from ancient civilizations knew about the value of pi but as it was then as it is now the exact value of pi has never been conclusively found because it is an irrational number.
You probably want the area of the donut between the two circles.The area of each circle is [ (pi) x R2 ].The area between two concentric circles is (pi)R12 - (pi)R22 = (R12 - R22)pi = (102 - 62)piThe "exact area" is 64(pi) inches2.The approximate number is 201.062 inches2 (rounded)