Let us assume we wish to draw three proportional circles to represent a firm’s annual sales over a three Usually, a one centimetre radius is about as small as can conveniently be drawn. Is also a constraint on the minimum size, especially if the circles are also to be divided up as pie charts. The symbols can be depends on how many are to be shown and the size of the paper to be used. I'll paste the relevant section from my course materials below:ĭesigning proportional circles is an exercise in fitting the symbols into the available space. So you would make the radius of the charts proportionate to those values.Ĭhart A could have a radius of 3cm and chart B could have radius of 2cm - and this should make the areas of the charts proportionate to the values being represented. The square roots would be 300 and 200 respectively. if you had chart A representing a total of $90,000 and chart B representing a total of $40,000 you would take the square root of both those values. The way I understand it is that the square root of the total value represented by the chart is proportionate to the radius of the circle. We have to produce a number of different pie charts of different sizes, so that the areas of the different charts are proportionate to the total value they are representing. I am doing a course at the moment where we have to do what you are asking.
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