In this python tutorial, you will learn about how to calculate area of a circle in Python, you can check the Python program to calculate area of a circle and, also we will check:
- Python program to calculate the area of a circle
- Python program to find the area of a circle using function
- Python program to find the area of a circle using the math module
- Python program to calculate the area and circumference of a circle
- Python program to calculate the area and circumference of a circle using an inbuilt math module
- Python program to find the area and perimeter of a circle
- Python program to calculate the area of a circle using class
- Python program to calculate the area and perimeter of a circle using class
Python program to calculate area of a circle
Let see python program to calculate the area of a circle.
- Firstly, we will take input from the user using the input() function for radius and store it in a variable.
- We can use constant to store the value of ‘pi’.
- Now, we will calculate the area of a circle by using the formula area = PI * r * r.
- And at last, print the area of a circle to get the output.
Example:
PI = 3.14
r = float(input("Enter the radius of a circle:"))
area = PI * r * r
print("Area of a circle = %.2f" %area)
You can refer to the below screenshot to see the output for python program to calculate the area of a circle
The above code, we can use to calculate area of a circle in Python.
Also, read, Python program to find an area of a rectangle and How to find area of a triangle in Python?
Python program to find area of a circle using function
Here, we will see python program to find the area of a circle using function.
- In this example, I have defined a function as def findArea(r).
- We can store the value PI = 3.14 which is fixed.
- The function is returned as return PI * (r * r)
- The function findArea(6) is called and it will print the output.
Example:
def findArea(r):
PI = 3.14
return PI * (r*r);
print("Area of circle = %.6f" % findArea(6));
You can refer to the below screenshot to see the output for the python program to find the area of a circle using the function.
The above python code to find area of a circle using function in Python.
Find area of a circle using Python math module
Now, we will see python program to find area of a circle using the math module.
- In this example, we will import math module which is an inbuilt module.
- We will take the radius as an input from the user.
- Now, we will calculate the area of a circle by using the formula area = math.pi * r * r. The value of “pi” is taken from the “math” module.
- And at last, print the area of a circle to get the output.
Example:
import math
r = float(input("Enter the radius of a circle:"))
area = math.pi * r * r
print("Area of a circle = %.2f" %area)
You can refer to the below screenshot to see the output for the python program to find the area of a circle using the math module.
The above code, we can use to find area of a circle using Python math module.
Also read, How to Create Countdown Timer using Python Tkinter.
Python program to calculate area and circumference of a circle
Let’s see python program to calculate the area and circumference of a circle.
- Firstly, we will take input from the user using the input() function for radius and store it in a variable.
- We can use constant to store the value of ‘pi’.
- Now, we will calculate the area of a circle by using the formula area = PI * r * r.
- And for calculating the circumference of a circle we will use the formula circumference = 2 * PI * r.
- And at last, print the area and circumference of a circle to get the output. The value is formatted up to two decimal places using %.2f.
Example:
PI = 3.14
r = float(input(' Please Enter the radius of a circle: '))
area = PI * r * r
circumference = 2 * PI * r
print(" Area Of a Circle = %.2f" %area)
print(" Circumference Of a Circle = %.2f" %circumference)
You can refer to the below screenshot to see the output for the python program to calculate the area and circumference of a circle.
This is the Python program to calculate area and circumference of a circle.
You may like, Python program to find the area of square.
Python program to calculate the area and circumference of a circle using an inbuilt math module
Here, we will see python program to calculate the area and circumference of a circle using an inbuilt math module.
- Firstly, we will import math module which is an inbuilt module.
- We will take input from the user using the input() function for radius and store it in a variable.
- Now, we will calculate the area of a circle by using the formula area = math.pi * r * r.
- And for calculating the circumference of a circle we will use the formula circumference = 2 * math.pi * r.
- And at last, print the area and circumference of a circle to get the output. The value is formatted up to two decimal places using %.2f.
Example:
import math
r = float(input(' Please Enter the radius of a circle: '))
area = math.pi * r * r
circumference = 2 * math.pi * r
print(" Area Of a Circle = %.2f" %area)
print(" Circumference Of a Circle = %.2f" %circumference)
You can refer to the below screenshot to see the output for the python program to calculate the area and circumference of a circle using an inbuilt math module.
Python program to find area and perimeter of a circle
Now, we will see python program to find the area and perimeter of a circle
- Firstly, we will take input from the user using the input() function for radius and store it in a variable.
- We have used 3.14 the value of pi in the formula.
- Now, we will calculate the area of a circle by using the formula area = 3.14* r * r.
- And for calculating the perimeter of a circle we will use the formula perimeter = 2*3.14*r
- And at last, print the area and perimeter of a circle to get the output.
Example:
r=float(input("Enter the Radius of circle: "))
area = 3.14*r*r
perimeter = 2*3.14*r
print("Area of Circle: ",area)
print("Perimeter of Circle: ",perimeter)
You can refer to the below screenshot to see the output for the python program to find the area and perimeter of a circle.
The above code, we can use to find area and perimeter of a circle in Python.
Python program to calculate area of a circle using class
Let see python program to calculate the area of a circle using class.
- In this example, we have created a class named “Circle” and it has an attribute radius as r.
- The constructor of the class initiates the attribute using the __init__function.
- We have used 3.14 the value of pi in the formula.
- The method “area” is created to calculate the area of a given circle.
- An instance of the class “Circle” is created as “obj” and the method is invoked to display the output.
Example:
class Circle:
def __init__(self, r):
self.radius = r
def area(self):
return 3.14 * (self.radius ** 2)
obj = Circle(8)
print("Area of circle:",obj.area())
You can refer to the below screenshot to see the output for the python program to calculate the area of a circle using class.
The above Python code is to calculate area of a circle using class.
Python program to calculate area and perimeter of a circle using class
Here, we will see python program to calculate the area and perimeter of a circle using class
- In this example, we have created a class named “Circle” and it has an attribute radius as r.
- The constructor of the class initiates the attribute using the __init__function.
- We have used 3.14 the value of pi in the formula.
- The two methods “area” and “perimeter” are created to calculate the area of a given circle.
- An instance of the class “Circle” is created as “obj” and the method is invoked to display the output.
Example:
class Circle:
def __init__(self, r):
self.radius = r
def area(self):
return 3.14 * (self.radius ** 2)
def perimeter(self):
return 2*3.14*self.radius
obj = Circle(3)
print("Area of circle:",obj.area())
print("Perimeter of circle:",obj.perimeter())
You can refer to the below screenshot to see the output for the python program to calculate the area and perimeter of a circle using class.
You may like the following Python tutorials:
- How to calculate simple interest in Python
- Python program to print pattern
- How to print factorial of a number in Python
- How to swap two numbers in Python
- How to subtract two numbers in Python
In this Python tutorial, we have learned about the Python programs to calculate the area of a circle. Also, we covered these below topics:
- How to calculate the area of a circle in Python
- How to find the area of a circle using a function in Python
- How to find the area of a circle using the math module in Python.
- How to calculate the area and circumference of a circle in Python.
- Python program to calculate the area and circumference of a circle using an inbuilt math module
- How to find the area and perimeter of a circle in Python
- How to calculate the area of a circle using class in Python
- How to calculate the area and perimeter of a circle using class in Python.
Python is one of the most popular languages in the United States of America. I have been working with Python for a long time and I have expertise in working with various libraries on Tkinter, Pandas, NumPy, Turtle, Django, Matplotlib, Tensorflow, Scipy, Scikit-Learn, etc… I have experience in working with various clients in countries like United States, Canada, United Kingdom, Australia, New Zealand, etc. Check out my profile.