3 ms·
http://www.xs4all.nl/~johanw/PhysFAQ/Relativity/GR/pi.html http://www.xs4all.nl/~johanw/PhysFAQ/Relativity/GR/pi.html
by gduffy 16y ago
http://www.xs4all.nl/~johanw/PhysFAQ/Relativity/GR/pi.html http://www.xs4all.nl/~johanw/PhysFAQ/Relativity/GR/pi.html