PROGRAMMING:Calculating the circular area
Enter the radius of the circle and calculate the area with two decimal places. Please use the pi constant in the math module.
### Input format:
### Output format:
### sample input:
```in
five point six
```
### sample output:
```out
ninety-eight point five two
```
answer：If there is no answer, please comment
### Input format:
### Output format:
### sample input:
```in
five point six
```
### sample output:
```out
ninety-eight point five two
```
answer：If there is no answer, please comment