pi^2
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3.14 x 3.14 = 9.8596
The circumference of a circle is equal to its diameter times pi. This is also equal to two times its radius times pi.
If you mean pi then: 50 times pi is about 157 to the nearest whole number
98.596
Not necessarily. i times pi is not a whole number, and yet e to the power of i times pi is equal to -1.