Good job! A couple of things about your code:
* Although it might seem silly, practice getting most of your code out of the main() method. You can read about it
here.
* Don't use Math.pow() for squaring a number. Just write
radius * radius.
* In general, you should declare variables just as you need them, so:
* "A" is not a good variable name, first because the naming convention is that a variable should begin with a lowercase letter, and second because it isn't clear what the variable is. Use "area" instead.