In this program number 12 in our series, let's calculate the area of a circle, as well as its circumference.
Formula:Area of Circle: π x r^{2}
Circumference of Circle: 2 x π x r
As the value of PI is a constant 3.14 all that we need to get from the user as input is the radius of the circle.
Python Code
"""
Program 12
 Write a Python program
Calculate Area and
Circumference of Circle
1000+ Python Programs by Code2care.org
"""
PI = 3.142
print("Program to calculate Area and Circumference of Circle");
radius = int(input("Enter the radius of Circle : "))
# Formula of the area of Circle
area = PI*radius*radius
# Formula of the circumference of Circle
circumference = 2*PI*radius
print("The Area of a circle with radius ", radius, " is ", area)
print("Circumference of a circle with ", radius, " is ", circumference)
Output Example:
Program to calculate the Area and Circumference of Circle
Enter the radius of Circle: 10
The area of a circle with a radius of 10 is 314.2
Circumference of a circle with 10 is 62.839999999999996
Python buildin functions used in this program
 print()  an inbuild function in Python 3  read more, we can also use of the fstrings along with print function to get the desired result.
 input(prompt)  an inbuild function again, with the prompt string that is printed out to the standard output without a trailing newline  read more

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