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Free online tool that helps you calculate the circumference and area of a circle based on its radius.

Circumference (c)

Area

Diameter

The circumference of a circle is the distance around the outer edge or boundary of the circle. It is the total length of the circle's perimeter. The circumference is calculated using the formula:

Circumference = 2 x π x r

where r is the radius of the circle and π (pi) is a mathematical constant that is approximately equal to 3.14.

The circumference is an important property of a circle, and it is used in various mathematical and scientific calculations involving circles, such as finding the length of an arc, the area of a sector, or the volume of a cylinder.

The area of a circle is the total amount of space inside the boundary or circumference of the circle. It is calculated using the formula:

Area = π x r^2

where r is the radius of the circle and π (pi) is a mathematical constant that is approximately equal to 3.14.