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zwpp/pi.rb

Last active August 29, 2015 14:03
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pi.rb
#!/usr/bin/ruby
# encoding: utf-8
include Math
n = 6
a = 0.5
b = 1/sqrt(3)
30.times do
n = 2*n
a = sqrt((1-sqrt(1-a**2))/2)
b = b/(sqrt(1+b**2)+1)
printf("%d\t%.20f\t%.20f\n", n, n*a, n*b)
end
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