Circle graphs are best used to compare the parts of a whole. .
The circle graph above shows the entire amount sold. It also shows each brand’s sales as part of that whole.
The circle graph uses the total of all items in the table.
Each sector of the circle graph is in the same proportion to the whole circle as the number of sales for that industry is to the entire amount of sales from the table.
To construct an accurate circle graph, you must first order the data in the table from greatest to least. You also need to find each part of the whole through several elaborate calculations and then use a protractor to draw each angle.
If we were asked to show that the Nike brand dominates the sneaker industry, then the circle graph would be a better choice for summarizing this data.