Significant figures
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In any measurement, the accurately known digits and the first doubtful digits are called significant figures.
The digits of pi are known to more than a trillion (1012) digits, but it is impossible to state all of them in this forum.
There is 5 trillion digits of pi.
Accurately known digits along with first doubtful digit are called significant figures.
As a new measurement, they measured King Henry's (I Think) foot. This is known as a "ruler"