See How to Calculate the Area below, but first the calculator: Enter the radius, diameter, circumference or area of a Circle to find the other three.

Oct 29, 2025 · To find the area of a circle, use the formula A = π • r2, where r is the radius of the circle. If you only know the diameter of the circle, then use the formula A = π • (d/2)2 where d …

The area of a regular polygon is half its perimeter multiplied by the distance from its center to its sides, and because the sequence tends to a circle, the corresponding formula–that the area is …

The area of a circle calculator will compute the surface of a circle using a radius or a diameter.

Jul 23, 2025 · In this article, we'll delve into five methods for calculating the area of a circle: using the radius, diameter, circumference, sector, and segment. Along the way, we'll cover the …

The area of a circle is the space enclosed within the boundary of a circle. It is calculated using the formula A = πr^2, where 'r' is the radius of the circle. It is measured in square units.

May 8, 2024 · You can find the area of a circle by using the area of a circle formula: A=πr² (where r is the length of the radius of the circle). Whenever you are calculating a circle’s area using …

The most common way to find the area of a circle is to use the formula shown below in blue. A = pi × r2 = π × r2. A = area. pi or π is a special mathematical constant, and it is approximately …

Area of a circle The area of a circle is the plane region bounded by the circle's circumference. The region shaded in gray inside of circle A above is its area. The area of a circle can be found …

The formula A = π r 2 calculates the area of a circle by squaring the radius and multiplying by π, which represents the ratio of a circle’s circumference to its diameter (approximately 3.14159).