NTU-OOP-Tuts-2025-1/T5Q3/src/Triangle.java

public class Triangle extends Polygon {
    public Triangle (String theName, float theWidth, float theHeight) {
        super(theName, theWidth, theHeight) ;
        this.polytype = KindofPolygon.POLY_TRIANG;
    }

    public float calArea() {
        return 0.5f * width * height;
    }
}