interface calcFigure{
	double calcArea( double x, double y );
	double calcVolume( double x, double y, double z );
}
 
class Triangle implements calcFigure {
    @Override
    public double calcArea(double x, double y) {
        return x * y / 2;
    }
 
    @Override
    public double calcVolume(double x, double y, double z) {
        return this.calcArea(x, y) * z / 3;
    }
}
 
class Rectangle implements calcFigure {
    @Override
    public double calcArea(double x, double y) {
        return x * y;
    }
 
    @Override
    public double calcVolume(double x, double y, double z) {
        return x * y * z;
    }
}
 
class CalcShape{
	public static void main( String [] args ){
		Triangle tr = new Triangle();
		Rectangle rc = new Rectangle();
 
		double x = Double.parseDouble( args[0] ); // 底面の1辺の長さ(△の底辺の長さ)
		double y = Double.parseDouble( args[1] ); // 底面のもう1辺の長さ(△の高さ)
		double z = Double.parseDouble( args[2] ); // 立体の高さ
 
		System.out.printf("三角形の面積:%.1f\n", tr.calcArea(x,y));
		System.out.printf("三角錐の体積:%.1f\n", tr.calcVolume(x,y,z));
		System.out.printf("四角形の面積:%.1f\n", rc.calcArea(x,y));
		System.out.printf("直方体の体積:%.1f\n", rc.calcVolume(x,y,z));
	}
}

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