It is: 3.1415927 is the value of pi when rounded to 7 decimal place
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The approximation of Pi is 22/7 and the most used form is 3.1416 (rounded up). To 30 decimal places, pi is : 3.14159 26535 89793 23846 26433 83279
Volume of cylinder: pi*12 squared *7 = 3166.725 cubic units rounded to 3 decimal places
0.1992
Rounded to five decimal places, sqrt(2) + sqrt(7) = 4.05996.
Pi can be written 2 ways, possibly more. The two ways I know of are these: 3.14 (rounded version) & 22 --- (the fraction form which is hard to write on a computer or this fraction form of 22/7) 7The value of pi has never been determined because it is an irrational number but it's usually taken as 3.14 to two decimal places or as 22/7 as a fraction.