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Happy pi day - March 14th

Posted: Thu Mar 14, 2019 7:21 pm
by ZX79
It was reported today that the record for pi is 31 trillion digits.

I don't know if this has been established already, if not, as a pi day challenge:

What is the most accurate approximation of pi that can be calculated using either the expanded or unexpanded ZX80?

Here are some suggestions for calculating pi:

https://en.wikipedia.org/wiki/Approximations_of_π
www.mathworld.wolfram.com/PiApproximations.html

Note, 10 PRINT "3.141592653589793" or similar, does not count. :-)