Similar Triangles

You can tell that triangles are similar if 2 of their interior angles are the equal to each other. Use the sliders and green points to change the triangles. Notice how they remain similar. What happens to the angles when you only change the White Triangle Size?

What happens when you move one of the green dots on the red/pink triangle?

If two of the angles are the same, what do you think is going to happen with the last angle measurement?