class Triangle (2 of 2)

public boolean isIsosceles() {

Point p1 = (Point) vertices.elementAt(0);

Point p2 = (Point) vertices.elementAt(1);

Point p3 = (Point) vertices.elementAt(2);

int d12 = dist(p1,p2);

int d23 = dist(p2,p3);

int d31 = dist(p3,p1);

return ((d12 == d23) || (d23 == d31) || (d12 == d31));

}

private int dist(Point p1, Point p2) {

return (int)((double)

Math.sqrt((double)(((p1.x - p2.x)*(p1.x - p2.x)) +

((p1.y - p2.y)*(p1.y - p2.y)))) );

}