pi*49 = 153.9 approx.
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Since the area of a circle is pi times the radius squared. The radius is 7. The diameter would be 14.
the same as pi squared, which is 9.86960440109
49*49 is 2,401
The square root of pi times pi is simply pi. Because pi*pi=pi squared, the squared and the square root will cancel each other, leaving just pi.
49 times