If you want to convey an honest impression of the data then pie charts are regarded as a bad idea as humans are less adept at comparing areas as they are length

If you want to convey an honest impression of the data then pie charts are regarded as a bad idea as humans are less adept at comparing areas as they are lengths - [http://en.wikipedia.org/wiki/Pie_chart#Use.2C_effectiveness_and_visual_perception http://en.wikipedia.org/wiki/Pie_chart#Use.2C_effectiveness_...]