September 17, 2009
No Comments
The perimeter of a circle is more commonly known as the circumference of a circle. The circumference of a circle is the length around it, and can be calculated from its diameter using the formula:
Or, substituting the radius for the diameter:
Where r is the radius and d is the diameter of the circle, and π (the Greek letter pi) is defined as the ratio of the circumference of the circle to its diameter (the numerical value of pi is 3.141 592 653 589 793…).
