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Click "Pie" from the "Charts" group to open a new pane of options. Click the first option in the "2D pie" section. Excel creates a pie chart representing the categories as percentages of a 24-hour ...
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 ...
Arrow charts and slope charts are alternatives to multiple pie charts when the data consist of the values or the percentage breakdown of several categories for two time periods.
The Graph Makeover Contest makes it clear that there are multiple ways to plot a data set with no one way being best. This post shows alternatives to a pair of donut charts.