Which of the following is NOT a method of determining the area of a circle?

Understanding the area calculations of a circle involves recognizing the correct mathematical principles and methods relevant to circles. The area of a circle is typically determined by formulas and methods that align with geometry principles focused on circular shapes.

The method of determining the area of a circle by adding corner area segments does not apply, as the concept of "corners" does not pertain to circles. Circles are defined by their continuous, curved perimeter, lacking any corners or angular formations that would exist in polygons. Instead, the area of a circle can be determined through methods that involve radii, segments, and sectors, where the enclosed space can be calculated accurately.

Other methods like subtracting the area of a triangle from the area of the circle, multiplying by the angle of a sector, or using the area of a segment are all valid approaches to derive or understand the area of circular sections. Each of these methods relies on known geometrical properties and formulas—such as the formula for the area of a triangle or segment of a circle, and the relationship between the central angle of a sector and its area.

By ruling out the addition of corner area segments, it becomes clear that the approach does not hold relevance to the calculations related to a circle, reinforcing the understanding of valid