It requires remembering 6 digits and it is just a little bit more accurate than directly remembering 6 digits of pi.
Here is a long article on other pi approximations: http://mathworld.wolfram.com/PiApproximations.html It turns out that 355/113 does a great job compared to most of the expressions given there! But none seem to be better than just remembering 3.14159.
Here is a long article on other pi approximations: http://mathworld.wolfram.com/PiApproximations.html It turns out that 355/113 does a great job compared to most of the expressions given there! But none seem to be better than just remembering 3.14159.