You will need
  • You will need the following values:
  • R - length of radius of the circle;
  • D - the length of the diameter of a circle;
  • π is a constant (π = 3.14)
Method 1. Let the plane of a circle. Its radius is equal to R. Then the length L of this circle is considered thus:
L = 2nr.
Example: the Radius of the circle R = 5 cm Then the length of circumference L = 2*3.14*5 = 31.4 cm
Method 2. Given a circle with diameter D. Then L is:
L = πD.
Example: the Diameter of a circle D = 10 cm Then L is calculated as:
L = 3.14*10=31.4 cm