1. Diagonals & Vertices 11/20/09 EQ: How can I tell how many diagonals a polygon has by counting its sides or vertices?

2. Review: Diagonal? Line of symmetry? Line segment? Side?

3. Review: Vertex? Vertices? How do you write the name of a line segment?

4. Review: How many diagonals in quadrilaterals? What do know about diagonals in quadrilaterals?

5. Make a t-chart. Column 1: # of sides Column 2: # of diagonals from 1 vertex

6. Hand out shapes. Draw diagonals from one vertex. Fill in chart.

7. Hand out shapes. Draw diagonals from one vertex. Fill in chart. What is the rule?

8. Draw a new t chart Column 1: # of sides Column 2: # of total diagonals

9. Draw diagonals from one vertex at a time. Fill in chart. What is the rule? Read the line segments.

10. EQ: How can I tell how many diagonals a polygon has by counting its sides or vertices?