Is the circle graph the same as a pie graph?

Answer 1

Yes because they both are circular and can be divided into the same groups.

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NB: There are two important classes of circular graphs.

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One is the Pie Graph, which relies on impressions of area to make its point. It's primarily visual, and best suited to showing such things as local-government statistics, budgets and the like.

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The other is the Polar Graph - of Amplitude v. Angle through (usually) a full circle though 0-180º semi-circles are common in certain applications. This a much more informative graph than the pie-chart, used in science and engineering. You may find these in the technical specifications of microphones and loudspeakers, giving the device's sensitivity w.r.t angle. Also sometimes in papers describing the echo-locating abilities of bats. A radar image is a sort of polar graph showing distance v. angle. The tachograph in the speedometer of a heavy goods vehicle or bus is another, rather special, example tracing vehicle speed v. time of day (For a 24-hour clock as this is, 1 hour = 15º of rotation).

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Microsoft has not heard of true circular graphs, which may be why the polar graph does not appear much here. The nearest Excel can be bothered to offer is a cack-handed polygon-tracer it calls a "Radar Chart", with the 360º and 0º points bizarrely given as separate radials, and desperately limited editing functions!