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/**
 *
 * @author felix
 */
public class circulo implements Figura{

    private double radio;
    
    circulo(double unRadio) {
        radio = unRadio > 0 ? unRadio : 0;
    }
        
    public void asigna_radio(double unRadio) {
        radio = unRadio > 0 ? unRadio : 0;
    }
    
    public double obten_radio(){
        return radio;
    }

    public double area() {
        return Math.PI*radio*radio;
    }

    public double perimetro() {
        return 2.0*Math.PI*radio;
    }

}