package cn.edu.bjut.chapter4_1;

public class Triangle extends Shape {
	private double a, b, c; 
	
	public Triangle(double a, double b, double c) {
		this.a = a; 
		this.b = b; 
		this.c = c; 
	}

	@Override
	public double area() {
		double p = (a + b + c) / 2; 
		
		return Math.sqrt(p * (p - a) * (p - b) * (p - c)); 
	}

	@Override
	public double perimeter() {
		return (a + b + c);
	}
}