public class Kreis extends Grundflaeche {
	private int r;
	
	public Kreis(int radius) {
		r = radius;
	}
	
	@Override
	public int umfang() {
		return (int) (2 * Math.PI * r);
	}
	
	@Override
	public int flaeche() {
		return (int) (Math.PI * r * r);
	}
	
	@Override
	public String toString() {
		return "Kreis mit Radius " + r + ", " + super.toString();
	}
	
}