# Python Program to Find Area of Circle

26 Sep 2019 1:12 pm || 0

This tutorial explains how to create a simple python program to find area of a circle. This article contains simple source codes to find out the area of a circle using circumference, diameter and radius of a circle.

### Formula to Calculate Area of a Circle

``A=π (r)2``

here π = 22/7, r = radius of circle

• With Diameter
``A=1/4πd2``

here π = 22/7, d = diameter of circle

• With Circumference
``A=c2/4π``

here π = 22/7,  c = circumference of circle

### Python Program to Find Area of Circle using Radius

``````#Program to find Area of Circle using radius

r = float(input("Enter the radious of circle : "))
#Taking radius measure unit from user
unit = input("Enter the measure unit of radius (e.g. in, cm) : ")
#finding area of a circle using ( A = /\R*R ) formula
area = ((22/7) * (r*r))
#printing the area
print("Area of circle is : ",area,unit+"2")
``````

OUTPUT :

``````Enter the radius of circle : 6.5
Enter the measure unit of radius (e.g. in, cm): m
Area of circle is : 132.78571428571428 m2``````

### Python Program to Find Area of Circle using Diameter

``````#Program to find Area of Circle using Diameter

#Taking diameter from user
diameter = float(input("Enter the diameter of circle : "))
#Taking diameter measure unit from user
unit = input("Enter the measure unit of diameter (e.g. in, cm) : ")
#finding area of a circle using ( A = 1/4 * /\ * D*D ) formula
area = ((1 / 4) * (22 / 7) * (diameter * diameter))
#printing the area
print("Area of circle is : ",area,unit+"2")``````

OUTPUT :

``````Enter the diameter of circle : 20
Enter the measure unit of diameter (e.g. in, cm) : in
Area of circle is : 314.2857142857143 in2``````

### Python Program to Find Area of Circle using Circumference

``````#Program to find Area of Circle using Circumference

#Taking circumference  from user
circumference  = float(input("Enter the circumference  of circle : "))
#Taking circumference  measure unit from user
unit = input("Enter the measure unit of circumference  (e.g. in, cm) : ")
#finding area of a circle using ( A = 1/4 * /\ * D*D ) formula
area = ((circumference  * circumference ) / (4 * (22 / 7) ))
#printing the area
print("Area of circle is : ",area,unit+"2")``````

OUTPUT :

``````Enter the circumference of circle : 42
Enter the measure unit of circumference (e.g. in, cm) : cm
Area of circle is : 140.3181818181818 cm2``````

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