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public class Triangle9 extends TwoDShape9 {

private String styleString;

// A default constructor.

public Triangle9() {

super(); // Call superclass constructor.

styleString = "none";

}

// Constructor

Triangle9(String s, double w, double h){

super(w, h); // Use super() to call the various forms of the TwoDShape constructor.

width = w;

height = h;

styleString = s;

}

// One argument constructor.

Triangle9(double x){

super(x); // Use super() to construct the various forms of the TwoDShape constructor.

styleString = "filled";

}

// Construct an object from an object.

Triangle9(Triangle9 ob){

super(ob); // pass object to TwoDShape9 constructor, i.e., pass a Triangle9 reference to TwoDShape9's constructor.

styleString = ob.styleString;

}

double area() {

return getWidth() * getHeight() / 2;

}

void showStyle() {

System.out.println("Triangle is " + styleString);

}

}