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Your measurement should include one estimated digit.
The estimated trillion digits of pi are 27 trillion digits. An exact equal value would require an infinite number of digits and cannot be proved to any exact trillions.
It is important to consider the precision of the measuring equipment.
It includes all of the digits that have been measured exactly, plus one estimated digit.
if between two other digits ex: 3009 or ending zeros when there is a decimal ex: 54.300
Significant
significant digits. for short they are called "sig. figs."
estimated
Estimated
Measuring Digits are TWELVE (inches) in the British System and HUNDRED (centimetres) in the Metric System
None of the digits need be estimated.
The last digit is always the estimated digit in a number
1
Your measurement should include one estimated digit.
Any digital device - as opposed to an analogue device.
analog
Significant Figure.