backup

5/Kreisflaeche.~ava

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+import java.text.DecimalFormat;
+
+public class Kreisflaeche {
+  public static DecimalFormat d = new DecimalFormat("0.00");
+  public  static void main(String[] args) {
+    kreisflaecheB(2);
+    
+  }
+  public static void kreisflaecheB( double r) {
+    System.out.println(d.format(Math.round( (Math.PI * Math.pow(r,2)) )));
+    
+  }
+
+}