31,415.9... etc
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pi squared is 9.869604401... pi cubed is 31.00627668
No because pi still remains as an irrational when squared.
7850 sq ft. Formula is pi x R squared. Diameter of 100 means Radius (r) is 50. 50 squared (multiplied by itself) is 25000. Multiply THAT by the value of pi- or 3.14, and you get 7850 sq ft.
It is: 144*pi
A radius squared fits pi times into a circle (The area of a circle divided by pi is the radius squared).