public class Triangle extends Shape {
    // 私有属性：底、高
    private double base;
    private double height;

    // 构造方法
    public Triangle(double base, double height) {
        this.base = base;
        this.height = height;
    }

    // 重写父类方法
    @Override
    public double getArea() {
        return base * height / 2;
    }
}