Pi to 50 decimal places.
3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510
August 2010, Shigeru Kondo used Alexander Yee's y-cruncher to calculate 5,000,000,000,000 digits of π. This remains the world record for any type of calculation, but significantly it was performed on a home computer built by Kondo. The calculation was done between May 4 and August 3, with the primary and secondary verifications taking 64 and 66 hours respectively.
I don't recommend trying to do it, you'll drive yourself insane.
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The answer will depend on which root.
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.
What is the diameter if the circumference is 2 inches? C = pi times d Diameter d = C / pi = 2 iches / 3.14156 = 0.63662 inches
Vol = pi*r2*h = 2124 cubic units.
Area = pi*r2 = 141 sq metres.