Sum of the Interior Angles in a Quadrilateral
Connect vertex A to each of the other vertices in the quadrilateral with a segment by moving the red sliders to the right
What did we just do?
Think About and Answer the Following Questions
1. What do you remember about the sum of the angles in a triangle?
1. How many sides does a quadrilateral have?
3. How many triangles were you able to create in the quadrilateral above?
4. What might you guess then would be the sum of all the angles in a quadrilateral? (Use you answers from questions #1 and #3)