This table summarizes the number of game consoles sold in three areas as of the end of 2010. The numbers are in millions.

(a) Present pie charts that show the market share within each geographic region. Size the pie charts to obey the area principle so that someone can see, for example, that the European market is larger than the market in Japan.
(b) Use a clustered bar chart to present these data, keeping the bars for each type of console in a group. What does this bar chart show that is not so evident in the pie charts?

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Playstation 3 Wii Xbox 360 Japan 6.3 11.5 1.4 Europe 19.7 24.9 13.7 12 30 18.6