• Module 5- Lesson 1   A Develop Understanding Task

    How Do You Know That?
       An introduction to proof illustrated by the triangle interior angle sum theorem. 

    Tear this apart and rearrange.

    What do the three angles add up to?
    Click on the link below (some will be guided to a second page to click in order) to watch a video proving that the angles of a triangle add up to 180 degrees