Circumference of a Circle
A circle is a geometric figure which is the set of all points in a plane that are equidistant from a given point called its centre. The circumference of a circle is the distance around all these points. The green circle around the circle below indicates the circumference of this circle.
The circumference of a circle can be calculated using the formula . So for a circle where the given diameter is 14, the circumference is . If we are given the radius of a circle we must first multiply the radius by 2 to get the diameter, and then perform the circumference calculation. So if we are given a circle with a radius of 4, the circumference would be or