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.
Questions:
From your observations, what is the sum of the measures of the interior angles of
any quadrilateral?