-8. alpha x 17.81
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The same as pi squared, which is roughly 9.86960440109
pi squared = approximately 9.8696044
pi radius squared. (radius squared, then multiply by pi.)
Negative pi is - 3.14.
n squared x n = n cubed but that does not equal 21. ---------------------------------------------------------------- Here is the correct version: We are looking for Pi squared times Pi which is Pi cubed Now Pi can never be written out exactly because its decimal number goes on for ever. However we can take a good approximation to Pi as 3.142 So Pi cubed = 3.142 x 3.142 x 3.142 = 31.018339 = 31.02 to 4 places.