/ Published in: Scheme
Referencing the Machin-like formula in the linked reddit comment. Should be as exact as Scheme allows.
URL: http://www.reddit.com/r/math/comments/f9ije/if_pi_is_the_ratio_of_a_circles_circumference_to/c1ebrc7
URL: http://www.reddit.com/r/math/comments/f9ije/if_pi_is_the_ratio_of_a_circles_circumference_to/c1ebrc7