import java.util.Scanner ;
public class CircleAreaCalculator {
public static void main
( String [ ] args
) { Scanner scan
= new Scanner
( System .
in ) ; System .
out .
print ( "กรุณากรอกตัวเลขของรัศมี : " ) ; double r = scan.nextDouble ( ) ;
scan.close ( ) ;
System .
out .
printf ( "\r \n พื้นที่ของวงกลม คือ %.2f" ,
Math .
PI * ( r
* r
) ) ; }
}
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