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# Python Program for Program to find area of a circle

The area of a circle can simply be evaluated using the following formula.

```Area = pi * r2
where r is radius of circle ```

## Python3

 `# Python program to find Area of a circle` `def` `findArea(r):``    ``PI ``=` `3.142``    ``return` `PI ``*` `(r``*``r);` `# Driver method``print``(``"Area is %.6f"` `%` `findArea(``5``));`   `# This code is contributed by Chinmoy Lenka`

Output

`Area is 78.550000`

Time Complexity: O(1) since no loop is used the algorithm takes up constant time to perform the operations
Auxiliary Space: O(1) since no extra array is used so the space taken by the algorithm is constant

## Python3

 `# Python program to find Area of a circle using inbuild library` `import` `math``def` `area(r):`` ``area ``=` `math.pi``*` `pow``(r,``2``)`` ``return` `print``(``'Area of circle is:'` `,area)``area(``4``)`  `# This code is contributed by Sejal Pol`

Output

`Area of circle is: 50.26548245743669`

Time Complexity: O(1)
Auxiliary Space: O(1)

Please refer complete article on Program to find area of a circle for more details!

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