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

Aug 3, 2023 · There are two ways to get the circumference of a circle. The first method uses a radius of the circle, while the second one involves the diameter to calculate the circumference.

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 …

How to calculate the circumference of a circle? The circumference of a circle is calculated using the formula: 2 x π x radius, where π is a mathematical constant, equal to about 3.14159.

The circumference of a circle is the distance around its edge. Calculate it instantly using our free tool with formulas C = 2πr (using radius) or C = πd (using diameter). You can also find the …

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 …

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 …

Another way to calculate the circumference of a circle is by using the formula: Circumference = π × Diameter. If we need to calculate the radius or diameter, when the circumference of a circle …

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 …

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.