In Polygon Explorations, you came up with a formula to find the sum of the measures of interior angles. Use that formula to fill out the chart below.
Chart (Print a chart for each student)
Name
Regular Polygons
Polygon  Number of Sides, n 
Number of Triangles (n2) 

Triangle  3 
1 
1(180)=180 degrees 
Quadrilateral  
Pentagon  
Hexagon  
Heptagon  
Octagon  
Nonagon 
Can you come up with a conjecture of a formula (in terms of n) of the sum of the measures of the interior angles of a convex ngon? Hintsee column 4 of your table.