Quadrilateral
Interact with this app for a few minutes. Be sure to move the quadrilateral's vertices around each time you decide to re-slide the slider!
Re: interior angles, into how many non-overlapping triangles was the quadrilateral split?
What is the sum of the measures of the interior angles of each non-overlapping triangle?
Using your answers to the 2 questions above, what would the sum of the measures of the interior angles of a quadrilateral be?
What seems to be the sum of the measures of the exterior angles of this quadrilateral?