A pie chart shows the frequency of each category as a sector of a circle. There are 360° in a circle, so each category will be represented in the pie chart as a proportion of 360°.

Even in charts and graphs, using colors in a common way can go a long way to achieving visual consistency. As noted in the pie chart section, the largest piece of data should always start at the top ...

A pie chart can show collected data in sectors. Each sector can be labelled, or can be colour coded with a key. When drawing a pie chart, a protractor will be used to draw the angles accurately.