triangle.java

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class Triangle extends Point 
{ 
// instance variables - replace the example below with your own 
Point a,b,c; 

public Triangle() 
{ 
 a=new Point(); 
b=new Point(); 
c=new Point(); 
} 


public Triangle(double x1,double y1,double x2,double y2,double x3,double y3) 
{ 
a=new Point(x1,y1); 
b=new Point(x2,y2); 
c=new Point(x3,y3); 
} 
private double dist(Point a1,Point a2) 
{ 
    double d; 
    d= Math.sqrt((a1.x-a2.x)*(a1.x-a2.x)+(a1.y-a2.y)*(a1.y-a2.y)); 
    return d; 
} 
public double lenth (){ 
    double d; 
    d=  dist(a,b)+ dist(b,c)+dist(a,c); 
    return d; } 
}