If pi=3.1416, then 6×3.1416=18.8416
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you said 4 pi times 6 to the second power.thats 452.38934236
923.62824015539921210801715468417
the same as pi squared, which is 9.86960440109
The formula for working out the circumference is 2pi x radius, aka pi diameter. The radius is 6 so times this by 2 and then pi. The answer would be: (6 x 2) x pi = 12 x pi = 37.69911184. Pay attention in maths lessons next time! ;) Hope this helps.
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.