Circle formula A circle is defined as the set of all points equidistant from a fixed point on a plane. There are many circle formulas , such as the area of a circle formula , circumference formula , and diameter formula , all of which are discussed below along with the equations for a circle . Parts of a circle The figure below shows the key parts of a circle that we need to know to be able to work with circles and their formulas . Diameter of a circle formula The diameter of a circle , is d = 2r ... Circle is a particular shape and defined as the set of points in a plane placed at equal distance from a single point called the center of the circle . We use the circle formula to calculate the area, diameter, and circumference of a circle . Use this free circumference calculator to find the area, circumference and diameter of a circle . Learn how to calculate the circumference of a circle using simple formulas (C=πd or C=2πr) . Understand its relation to radius & diameter, and explore real-life examples.
