It is: 144*pi
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Pi is approximately 3.14159. Squaring 12 gives you 144. So, pi times 12 squared is roughly 452.39056. Don't ask me what you need that for, but there you have it.
pi squared is 9.869604401... pi cubed is 31.00627668
No because pi still remains as an irrational when squared.
31,415.9... etc
A radius squared fits pi times into a circle (The area of a circle divided by pi is the radius squared).
pi*radius squared