In this post, we will write a program for how to calculate the area of a circle in python.
First, let’s see What is the Area of Circle?
The area enclosed by a circle of radius r in 2-dimensional plane.
Formula:
Area of circle: A = pi * r * r Or pi * r 2 Where, r = Radius of circle pi = pi is geek letter which is a constant whose approximate value is 3.14159...
Examples:
Input: Radius = 7
Output: The area of the circle is 154.0Input: Radius = 2
Output: The area of the circle is 12.56
Let’s see the program for this:
Code Version 1: Create a user-defined function that will calculate and print the area of a circle.
# define a function for # finding area of a circle def area(r): # constant value of PI PI = 22/7 # printing the radius print("Radius =", r) # calculating the area area = PI * (r * r) # printing the area print("The area of the circle is", area) # main code if __name__ == "__main__" : # input radius radius = 7 # function calling area(radius)
Output:
Radius = 7 The area of the circle is 154.0
Code Version 2: Create a user-defined function that will calculate and print the area of a circle. In this code version, we are using pi constant value which is directly taken from the math library.
# including pi constant # from the math library # into this program from math import pi # defina a function for # finding area of circle def area(r): # printing the radius print("Radius =", r) # calculating the area area = pi * (r * r) # printing the area print("The area of the circle is", area) # main code if __name__ == "__main__" : # input radius radius = 7 # function calling area(radius)
Output:
Radius = 7 The area of the circle is 153.93804002589985