public static float getPerimeter(Float2 t1, Float2 t2, Float2 t3)
{
Float2[] vertices = new Float2[] { t1, t2, t3 };
vertices.OrderBy(v => v.x);
float a = (t2 - t1).getLength();
float b = (t3 - t2).getLength();
float c = (t1 - t3).getLength();
return(a + b + c);
}