Phase B: 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?
Use what you've learned to determine the measure of the missing angle in each figure.
