6
3.141,592,653,589,793,238,462,643,383,279,502,884,197,169,399,375,105,820,974,944,592,307,816,406,286,208,998,6
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The fifth digit of pi is 5. The first 10 digits are 3.141592653
6
3.14 is always the best 3 digit approximation of pi.
Functions must have a property of predictability. So, there will never be a function (hence then this is a non-function) to predict the nth digit of pi. We can calculate the digits of pi in order one at a time, but there will never be a function that will take us directly to the 1,001st digit of pi.
The equation to find the area of a circle is pi x r2, let us just keep pi as pi, if the radius is 7, 72 is 49, so in terms of pi, the answer would be 49 pi, then one would just multiply 49 to whatever digit of pi you wanted to. answer is 153.86 :)