Enter any one of the value (A, C, d, r) to know the other remaining terms along with their formulas.
Calculate the total distance around a circular object. This circumference calculator helps you to find the circumference, radius, diameter, and area of any circle.
Circumference Definition:
The circumference is the linear distance around the outside of the circle.
The circumference of a circle is similar to the perimeter of a polygon. The ratio of the circumference to the diameter of a circle is always equal to π. Here we have formulas to determine the circumference of a circle along with the radius, diameter, and area.
The circumference of a circle for any given variable can be calculated using the formula:
C = 2πr = πd
Where:
π = pi = 3.14159
In reverse to determine the radius and diameter of a given circular shape, we can use the circumference calculator but for manual calculations here are formulas for the radius & diameter.
r = d/2
d = 2r
A = πr2 = πd2 / 4
If the diameter of a circle is 18cm, then what is the circumference of that circle?
Solution:
The formula to find the circumference is:
C = 2πr = πd
Insert the values into the formula:
C = 3.14 * 18cm
C = 56.52cm
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