It is 341!
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There is no "best" approximation. The square root is irrational and so it is a non-terminating, non-recurring decimal so adding one more digit will always make it a better approximation.
C = πd80 = πd80/π cm = d25.46 = d (decimal approximation)25.46 / 2 = r12.73 cm = r (decimal approximation)
10/13 as a decimal is a recurring decimal of 6 digits: 0.769230769230... An approximation would be 0.769
There is no finite-length decimal number for pi. The decimal for pi goes on until infinity! The most commonly used approximation is 3.14
It is about 9.487 rounded to 3 decimal places