The area of a circle calculator helps you compute the surface of a circle given a diameter or radius. Our tool works both ways — no matter if you're looking for an area-to-radius calculator or a radius to the …

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 · You can find the area of a circle using the radius, the diameter, or the circumference. To find the area using the radius, or the length from the center of the circle to the edge, use the formula …

In geometry, the area enclosed by a circle of radius r is πr2. Here, the Greek letter π represents the constant ratio of the circumference of any circle to its diameter, approximately equal to 3.14159. One …

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.

Oct 25, 2023 · What is the Area of a Circle The area of a circle is the space occupied by the circle in a two-dimensional plane. It is expressed in square units such as m 2, cm 2, etc. The shaded region …

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 using the …

The formula to find a circle's area $$ \pi $$ (radius) 2 usually expressed as $$ \pi \cdot r^2 $$ where r is the radius of a circle.

Instantly find the area, circumference, radius, or diameter of any circle with full precision. Perfect for homework and construction.

Learn about the area of circles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.