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interface calcFigure{
	double calcArea( double x, double y );
	double calcVolume( double x, double y, double z );
}
//(ここを作成)
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));
	}
}

Main.java:8: error: cannot find symbol
		Triangle tr = new Triangle();
		^
  symbol:   class Triangle
  location: class CalcShape
Main.java:8: error: cannot find symbol
		Triangle tr = new Triangle();
		                  ^
  symbol:   class Triangle
  location: class CalcShape
Main.java:9: error: cannot find symbol
		Rectangle rc = new Rectangle();
		^
  symbol:   class Rectangle
  location: class CalcShape
Main.java:9: error: cannot find symbol
		Rectangle rc = new Rectangle();
		                   ^
  symbol:   class Rectangle
  location: class CalcShape
4 errors

Standard output is empty