In this article we will illustrate c program to calculate area of circle. Area_circle P r r. We know that the area of a circle is p r² where r is the radius of the circle.
Visual on the figure below.
The value of p is 31415 up to fourth decimal places. We use the following mathematical formula for calculating area and circumference of the circle In JavaScript. The value of p is 31415 up to fourth decimal places. Area of Circle radius radius PI circumference of the circle 2 radius PI.