A pie chart is graph that you can use to represent the proportion for each category in the data. The pie is divided into slices, with each slice representing a category of data. By comparing and contrasting the size of the slices, you can assess the relative magnitude of each category.
To add slice labels, with the graph active, choose.
To expand pie slices, select and then double-click the pie or a slice of the pie and click the Explode tab.