## Description

In this tutorial, we will learn all about the circle ( area, circumference ) with all types of method. Inbuild Methods, function, simple so on. You can write the Program to calculate area of a circle and, also calcuate the operation below...

• Calculate the area of a circle in Python Programming language
• Find the area of a circle using function in Python
• Find the area of a circle using the math module in python
• Python program to calculate the area and circumference of a circle
• Python program to calculate the area and circumference of a circle using an inbuild math module
• Python program to find the area and perimeter of a circle

## Calculate the area of a circle in Python Programming language

• Take input from the user using input() function for radius and store in a variable
• Use constant variable to store the value of "PI".
• And, Calculate the area of a circle with the formula area = PI * r *r.
• And, in Last, print the area of circle
``````r = float(input("Enter the radius of Circle : " ))
PI = 3.14

area = PI * r * r

print("Area : ",area)

'''
#Output:
Enter the radius of Circle : 2
Area :  12.56

'''``````

## Find the area of a circle using function in Python

• defined a function as def area_of_circle().
``````def area_of_circle(r):
PI = 3.14
return PI * r * r

r = float(input("Enter the radius of Circle : "))
print("Area : %.6f" % area_of_circle(r))

'''
#Output

Enter the radius of Circle : 3
Area : 28.260000

''' ``````

## Find the area of a circle using the math module in python

• import math module which is inbuilt module
• take the input radius from the user
• now, calculate the area of using this formula area = math.pi * r * r. The value of "pi" is taken from the "math" module
• And, print the area of circle
``````import math

r = float(input("Enter the radius of Circle : "))

area = math.pi * r * r

print("Area : ", area)

'''
#Output:
Enter the radius of Circle : 2
Area :  12.566370614359172

'''``````

## Python program to calculate the area and circumference of a circle

• Take input from the user using input() function for radius and store it in a variable.
• use constant to store the value of "PI".
• Now, calculate the area of circle by using formula area = PI * r * r.
• And Caluclating the circumference of a circle, using the formula circumference = 2 * PI * r.
• print the area and circumference of a circle.
``````PI = 3.14

r = float(input("Enter the radius of Circle : "))

area = PI * r * r

circumference = 2 * PI * r

print("Area of Circle : ", area)

print("Circumference of Circle : ", circumference)

'''
#Output:
Enter the radius of Circle : 5
Area of Circle :  78.5
Circumference of Circle :  31.400000000000002

'''``````

## Python program to calculate the area and circumference of a circle using an inbuild math module

``````import math

r = float(input("Enter the radius of Circle : "))

area = math.pi * r * r

circumference = 2 * math.pi * r

print("Area of Circle : ",area)
print("Circumference of Circle : ", circumference)

'''
#Output:
Enter the radius of Circle : 5
Area of Circle :  78.53981633974483
Circumference of Circle :  31.41592653589793

'''``````

## Python program to find the area and perimeter of a circle

• Take input from the user using input() function for radius of circle
• use constant to store the value of "PI".
• Calculate the area of circle using the formula area = PI * r * r
• and calculating the perimeter of a circle we will use the formula perimeter = 2 * PI * r
• print the area and perimeter of circle
``````PI = 3.14

r = float(input("Enter the radius of circle : "))

area = PI * r * r
perimeter = 2 * PI * r

print("Area of Circle : ", area)
print("Perimeter of Area : ", perimeter)

'''
#Output:
Enter the radius of circle : 6
Area of Circle :  113.03999999999999
Perimeter of Area :  37.68

'''``````

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