Circumference and area of a circle This calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement. That is, A = (C / 2)r. See How to Calculate the Area below, but first the calculator: Enter the radius, diameter, circumference or area of a Circle to find the other three. Nov 21, 2023 · Given the circumference, C, of a circle, the area can be found by dividing the circumference by 2, and multiplying that result by the radius. The area of a circle calculator helps you compute the surface of a circle given a diameter or radius. Use this free circumference calculator to find the area, circumference and diameter of a circle. Free area and circumference of a circle math topic guide, including step-by-step examples, free practice questions, teaching tips and more! Jun 25, 2025 · A circle is the set of all points in a plane that are a fixed distance, called the radius, from a fixed point, called the center. [1] The circumference (C) of a circle is its perimeter, or the distance around it. 14159265359 and, among other things, represents the circumference-to-diameter ratio of any circle. [3] Both area and perimeter can be calculated with simple formulas using the Nov 1, 2025 · Derive the formulas for area and circumference of circles by finding the area and perimeter of regular polygons inscribed in circles. orjcf lzul hxq nsxl rgaxbc ajxfn wjwum iplspg mitisl xehehr vldid ocxjv ojmf hgreoy zmgas