Use this free circumference calculator to find the area, circumference and diameter of a circle.

Aug 3, 2023 · What is the circumference of a Circle – learn how to find it with equation, and solved examples

Oct 7, 2025 · Use the formula C = πd to find the circumference if you know the diameter. In this equation, "C" represents the circumference of the circle, and "d" represents its diameter. That …

The first method is to use the standard formula of the circumference of a circle, where we need to convert the given diameter into the radius. The second method is to perform a direct …

Jul 23, 2025 · The correct way to find the perimeter of a circle is to calculate it using the formula C = 2π × r. If the diameter or radius of a circle is known circumference of the circle can be easily …

Aug 1, 2025 · Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three …

The formula for circumference is based on the constant π (pi), which is an irrational number approximately equal to 3.14159. π is the ratio of the circumference to the diameter of any circle.

Learn how to calculate circle circumference, arc lengths and sector perimeters within circles, in this GCSE Maths revision guide.

The formula for the circumference of a circle is expressed using the radius 'r' of the circle and the value of ' pi '. It is expressed as, Circumference of a circle formula = 2πr.

In a regular octagon (8 sides), with a given radius = 10 inches, find the perimeter. • (apothem is "height" of Δ CAB). To find the perimeter, we need to know the length of one side of the …