I'm not going to source this at the moment, but I'm 80% sure I've read studies that show pie charts increase audience confidence that they understand material b

I'm not going to source this at the moment, but I'm 80% sure I've read studies that show pie charts increase audience confidence that they understand material but reduce their accuracy. Pie charts seem simple and easy to understand, which is really the most dangerous flaw. It's difficult for the human visual system to compare areas accurately.