Variable "$radius" is not imported at circum1.pl line 19.
Variable "$radius" is not imported at circum1.pl line 20.
Variable "$radius" is not imported at circum1.pl line 23.
Variable "$c" is not imported at circum1.pl line 30.
Global symbol "$radius" requires explicit package name (did you forget to declare "my $radius"?) at circum1.pl line 19.
Global symbol "$radius" requires explicit package name (did you forget to declare "my $radius"?) at circum1.pl line 20.
Global symbol "$radius" requires explicit package name (did you forget to declare "my $radius"?) at circum1.pl line 23.
Global symbol "$c" requires explicit package name (did you forget to declare "my $c"?) at circum1.pl line 30.
Execution of circum1.pl aborted due to compilation errors.