# Geometric Series

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Videos, worksheets, games and activities to help Algebra II students learn about geometric series.

What is a Geometric Series?
We can use what we know of geometric sequences to understand geometric series. A geometric series is a series or summation that sums the terms of a geometric sequence. There are methods and formulas we can use to find the value of a geometric series. It can be helpful for understanding geometric series to understand arithmetic series, and both concepts will be used in upper-level Calculus topics.

The formula for the partial sum of the first nth terms of a geometric series is

$${S_n} = \frac{{{a_1}\left( {1 - {r^n}} \right)}}{{1 - r}}$$

This video introduces geometric series.

Geometric Series

This videos shows how to determine if an infinite geometric series converges or diverges.
Infinite Geometric Series

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