Triangle Dilation

Use the slider to control "k" which is the scale factor of the dilation of triangle ABC to triangle A'B'C'.

1) If k = 1, how does triangle ABC compare to triangle A'B'C'? 2) If k = 2, how does triangle ABC compare to triangle A'B'C'? 3) If k = .5, how does triangle ABC compare to triangle A'B'C'? 4) What is the difference between dilating the triangle k = 2 and k = -2?