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
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In a circle the area is A=pi*r2 so: A=pi*72 = pi*49 = 153.9380 So, an approximate value would be 153.94 square units
You calculate the volume of three-dimensional figures, not of numbers like pi.
C = 2 * (pi) * (radius) So plug in 2 for radius C = 2 * (pi) * (2) C= 4(pi) If you need to approximate multiply 4 times 3.14. If you do not need to approximate then your answer is 4(pi)
pi (π) = 3.14159265
the answer is 22 to 7 or 22:7