Quadrilateral Angle Theorems

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: M1, M2, M3, & M4 serve as midpoints of the sides of this quadrilateral.
1) What geometric transformations took place in the applet above?
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2) When working with the quadrilateral's interior angles, did any of these transformations    change the measures of these interior angles?
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3) From your observations, what is the sum of the measures of the interior angles of    any quadrilateral?
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4) When working with the quadrilateral's exterior angles, did any of these transformations change the measures of these exterior angles?
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5) From your observations, what is the sum of the measures of the exterior angles of    any quadrilateral?
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– John Williams, Tim Brzezinski

Information: Quadrilateral Angle Theorems