# How do I use an infinite series to find an approximation for pi?

##### 1 Answer
Oct 31, 2015

$\frac{\pi}{4} = 1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \ldots$

#### Explanation:

This is the Leibniz series for $\pi$.
https://en.wikipedia.org/wiki/Leibniz_formula_for_%CF%80

Other series can be found in the link below
http://www.geom.uiuc.edu/~huberty/math5337/groupe/expresspi.html

Use the first few terms of the series to approximate $\pi$.