# Unit Circle Chart Twelfths π (pi)

This figure illustrates the unit circle chart annotated using (pi) for measuring radian angles. See how to build the unit circle chart for how to build the chart. See unit circle pdf for a printable PDF of the chart.

Figure |
---|

The unit circle chart shows the position of the points along the circle that are formed by dividing the circle into eight and twelve parts.

The greek letter π (pi) is a geometric constant approximately equal to 3.1416. Its value is equal to the length of any circle's circumference divided by its diameter.

This page provides a printable unit circle chart annoated with τ (tau). This chart shows the points and angles formed from dividing the unit circle into eight and twelve parts.