GradeGen

The distance from the centre of a circle to its circumference.

If one data set contains twice as many people as another, its circle must have twice the area—not twice the radius.

For comparative pie charts, scale the area, not the radius: multiply the radius by the square root of the total-frequency ratio.

The distance from the centre of a circle to its circumference.

If one data set contains twice as many people as another, its circle must have twice the area—not twice the radius.

For comparative pie charts, scale the area, not the radius: multiply the radius by the square root of the total-frequency ratio.

Radius