# Concave Polygons

- Author:
- jordan.ashton

- Topic:
- Polygons

1. What is the sum of the interior angles of this polygon?
2. Using the red vertex labelled "Move", drag it to another position. What happens to the red angle? What happens to the two angles adjacent (next to) the red angle?
3. What is the sum of the interior angles of your new polygon?
4. Move the red vertex towards the green vertex.