Suppose you only know the diameter? If the diameter is 8 cm, then the circumference is c = π(8) = 8 π or 25.1 cm, rounded to the nearest tenth.Ī great thing about the formulas is that you can manipulate it to solve for an unknown if you know one of the other quantities. If you prefer a numerical value, the answer rounded to the nearest tenth is 37.7 cm. If r = 6 cm, the the circumference is c = 2 π(6) = 12 π cm, if writing in terms of π. Let’s calculate one manually, for example. This depends on whether or not you know the radius ( r) or the diameter ( d) The circumference is similar to the perimeter in that it is the total length needed to draw the circle. The equations will be given below so you can see how the calculator obtains the values, but all you have to do is input the basic information.
The circle calculator finds the area, radius, diameter and circumference of a circle labeled as a, r, d and c respectively.įor those having difficulty using formulas manually to find the area, circumference, radius and diameter of a circle, this circle calculator is just for you.
How to Calculate Circumference, Diameter, Area, and Radius
