Triangle Angle Sum

Move the vertices of the triangle to create the triangle that you want. and then move the slider to the extreme right?
1.) After moving the slider to the extreme right, what can you say about the angles having the same color? Why? 2.) What is the sum of the three angles that meet at a point? Explain your answer. 3.) What is the relationship between the angles that meet at a point and the interior angles of a triangle? 4.) Move the slider to the extreme left and change the shape of your triangle. Answer 1-3 again. 5.) What conjecture can you make based on your observation above? Prove your conjecture.