The circumference of a circle is the distance around the boundary of the circle. It is the same as calculating the perimeter of any polygon such as triangle, square, and rectangle. The circumference of a circle is measured in units of meters, kilometers, inches, etc. The diagram below shows the circumference of a circle.
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 is to say, you can find the circumference of a circle just by multiplying the diameter by pi. Plugging π into your calculator will give you its numerical value, which is a closer approximation of 3.14 or 22/7. [1 ...
Circumference formula using radius Since the diameter (d) is two times the radius (r), another circumference formula is: Circumference formula using area The circumference of a circle can also be found if the area (A) of the circle is known using the circumference formula: Below are some circumference examples.