You can put shadows on individual pie wedges or on the pie as a whole. Putting shadows on individual wedges makes it look as if the wedges are on different layers, so when you add a shadow to a pie wedge, it’s generally a good idea to separate it first. See Separating Individual Wedges from a Pie Chart for instructions.
Select the chart or individual pie wedges. Click Inspector in the toolbar, and then click the Chart inspector button. Do one of the following:
To add shadows to individually selected wedges, choose Individual from the Shadow pop-up menu.
To add a shadow to the chart as a whole, choose Group from the Shadow pop-up menu.
To set shadow attributes, use the Graphic inspector.
See Adding Shadows for instructions.