A diagram of a circle with all but one third of it shaded is shown in the image below.
A percentage of the circle that is not shaded is 33.33%.
In Mathematics and Euclidean Geometry, a percentage is any number that is expressed as a fraction of hundred (100). This ultimately implies that, a percentage indicates the hundredth parts of any given number.
Based on the information provided above, we can logically deduce that one third (1/3) of the circle would not be shaded. In this context, a fraction of the segments of the circle that would be shaded can be calculated as follows;
Shaded portion = 1 - 1/3
Shaded portion = 2/3 of the circle.
For the percentage of the circle that is not shaded, we have;
Percentage not shaded = 1/3 × 100
Percentage not shaded = 0.3333 × 100
Percentage not shaded = 33.33%.