public class Triangle {
    double base;
    double height;
    public Triangle() {
        this.base = 30;
        this.height = 35;
    }

    public double calcArea() {
        return base*height/2;
    }

    public void setBase(double base) {
        this.base = base;
    }

    public void setHeight(double height) {
        this.height = height;
    }
    
}