public class Triangle implements iShape
{
    private double base;
    private double height;
    
    public Triangle(double base, double height)
    {
        this.base = base;
        this.height = height;
    }
    
    public double area()
    {
        return (base * height) / 2;
    }
    
    public double perimeter()
    {
        //assuming this is a right triangle
        double c = Math.sqrt(base*base + height*height);
        return c + base + height;
    }
}