# Interior and Exterior Angles of a Quadrilateral

- Author:
- Marilu Deal, Tim Brzezinski

- Topic:
- Angles

Interact with the applet below for a few minutes.
Then, answer the questions that follow.
Be sure to change the locations of the quadrilateral's

**BIG BLACK VERTICES**each time*before*you drag the slider!!! Note:*M*_{1, }*M*_{2, }*M*_{3, }&*M*_{4 }serve as midpoints of the sides of this quadrilateral.**Questions:**1) What happened when you dragged the black vertices? 2) When you dragged the slider to the other end, what happened? 3) From your observations, what is the sum of the measures of the interior angles of

*any quadrilateral?*4) Select Exterior Angles. What happened when you dragged the vertices? 5) When you dragged the slider to the other end, what happened? 6) From your observations, what is the sum of the measures of the exterior angles of

*any quadrilateral?*