[OC] Calculating pi by alternating adding and subtracting every odd number fraction. So 1/1 - 1/3 + 1/5 - 1/7 +1/9 -1/11+...

from /r/dataisbeautiful

[OC] Calculating pi by alternating adding and subtracting every odd number fraction. So 1/1 - 1/3 + 1/5 - 1/7 +1/9 -1/11+...