Infinitely many. This is because pi is an irrational number, which means the decimal places neither terminate (such as 2.5) nor repeat (such as 0.333...). This also means that pi cannot be expressed as the fraction of two integers (such as 4/9). The proof of this dates back to the 18th century.
At the moment, pi has been computed to more than a trillion (1 000 000 000 000) digits.
For most practical purposes, just the first few digits are enough. Rounding pi to 3.14 gives an error of
pi - 3.14 = 0.00159265...
which is suitable for common use. Pi truncated to 11 digits could measure the circumference of the earth with the precision of a millimeter.
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Pi has an infinite number of decimal places
Pi to five decimal places is 3.14159.
Not exactly. To 2 decimal places, pi is 3.14 To 7 decimal places, pi is 3.1415927 To 9 decimal places, pi is 3.141592654 pi does not terminate - it can be expressed to as many decimal places as required. 3.14 is often used as an approximation when doing calculations as it's easier to work with (than 3.141592653... ).
Pi is an irrational number and it is 3.14 to two decimal places
It is: circumference/diameter = pi which is 3.142 rounded to 3 decimal places