You can tell that triangles are similar if 2 of their interior angles are the equal to each other. [br][br]Use the sliders and green points to change the triangles. Notice how they remain similar. [br][br][br]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?