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 build-in functions used in this program

**print()**- an inbuild function in Python 3 - read more, we can also use of the f-strings 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

Facing issues? Have Questions? Post them here! I am happy to answer!

**Author Info:**

Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.

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