What procedure can be used to find the angle of the 4th section in a circular pie graph when 3 angles are known?

To find the angle of the 4th section in a circular pie graph when the angles of the other three sections are known, you would subtract the sum of the three known angles from 360 degrees. This is appropriate because a full circle is 360 degrees, and the angles represented in the pie chart must sum to this total.

Calculating in this way ensures that you account for the entirety of the circle. The process involves first adding the three angles together to obtain their sum and then subtracting this sum from 360 degrees to arrive at the missing angle. This allows you to maintain the integrity of the pie chart, which visually represents proportional data where all parts must equal a whole.

Using 180 degrees would be incorrect, as this applies to triangles rather than circular graphs. Dividing the known angles does not yield the fourth angle and would not contribute to calculating the total around a circle. Therefore, using the sum of the three angles and its relationship to the total of 360 degrees effectively determines the missing angle for the fourth section.