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# Python Program to Find Area of a Circle

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

`Area = pi * r2where 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``));`

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``)`

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!