Area of a circle p d2 2. The area of a circle is pi times the square of its radius. The span between the center and the boundary line is known as the radius and it is represented by r.
It doesnt matter whether you want to find the area of a circle using diameter or radius - youll need to use this constant in almost every case.
P Pi 314159. Visual on the figure below. The Python area of a circle is number of square units inside the circle. Calculating Area of Circle using Radius.