Triangle Exterior Angle-Sum Theorem

Move the sliders.[br]What do you notice about the exterior angle and the remote interior angles[br](the two angles [i]not[/i] adjacent to the exterior angle)?[br][br]Move the sliders back and drag the vertices to change the shape of the triangle to see if it always works.[br][br]What can you say about the sum of the two remote interior angles compared to the exterior angle?

Information: Triangle Exterior Angle-Sum Theorem