Which formula correctly calculates the area of a circle?

The formula that correctly calculates the area of a circle is based on the radius, which is one of the fundamental aspects of circular geometry. The correct formula is π x Radius x Radius. Given that the radius is half of the diameter, this formula effectively captures the geometric relationship needed to calculate area.

While some of the incorrect options might seem plausible at first glance, they do not adhere to the standard mathematical definitions used in calculating the area of a circle. For example, the formulas involving the diameter or other constants do not represent the area accurately based on established geometric principles. Therefore, the area is strictly defined by the radius and the formula π x Radius x Radius accurately reflects this relationship.