How can a circle graph be used to compare data?

Answer 1

A circle graph or pie chart shows the relative size relationship among parts of a whole as a circle with lines from the center to the edge dividing the circle into parts of the same relative sizes. For example, if you wanted to illustrate that 3/16 of the class likes breakfast best, 5/16 prefers lunch and half prefer dinner, you would show a circle divided into three parts, one part being 3/16 of the circle, one part that is 5/16 of the circle, and the third being half of the circle. In other words, you would make a line from a point on the circle through the center to the point on the opposite edge of the circle, dividing it in half. Then you would draw another line from the center to the edge that is 67.5° or 112.5° from the first line (67.5° is 3/16 of 360°, 112.5° is 5/16 of 360°, and 360° is a full circle). Then label the parts.