The formula "A = πr²" is used to calculate the area A of a circle. In this equation, π (pi) is a constant approximately equal to 3.14, and r represents the radius of the circle, which is the distance from the center to the edge. By squaring the radius (multiplying it by itself) and then multiplying by π, you can find the total area enclosed by the circle. This formula is essential in various fields, including mathematics, engineering, and physics. Understanding how to apply "A = πr²" allows for practical applications, such as determining the size of circular objects, calculating land areas, and solving problems involving circular shapes in real life.