# Circle Class

You are asked to create a

`Circle`

class which should include the following:- An
`__init__`

method that sets the`radius`

of the circle. If no radius is provided during instantiation, the default radius value should be`1`

.

- A method
`area()`

that calculates and returns the area of the circle.

- A method
`circumference()`

that calculates and returns the circumference of the circle.

The methods should not print the results but return them.

You should use the

`math`

module to calculate the area and the circumference.Input | Output |

`circle = Circle(); print(circle.area()); print(circle.circumference())` | 3.141592653589793
6.283185307179586 |

`circle = Circle(3); print(circle.area()); print(circle.circumference())` | 28.274333882308138
18.84955592153876 |

#### Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB