In the first graph, it says computer usage worldwide increased 342% from 2000-2007, and they show a circle inscribed inside a circle with a radius 242% larger, problem is, this would increase the area by quite a bit more than 342%. That circle diagram actually shows a 1,170% increase.

If you're going to make a diagram using the area of a circle to demonstrate growth, make sure your data is refelected in the area of the circle, not the radius, and make sure that when you are saying something has grown by 342%, you don't just multiply by 3.42 to find the new amount, you multiply by 3.42 and then add the original amount.

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