Finidng the Sum of all angle measures.

The Sum of all angle measures for polygons

Jack's: ( # of sides-2) x180= sum of angle measure



Delany's: (# of sides x 180) -(180 x 2) 



360/4= 90 (square) 
1440/10=144 (Decagon)

To find the single angle measure
Sum of the angle measures 

sum of the angle measures/# of sides= single angle measure 
 
1. Devon: Tore off the corners and put them together. 

2. Trevor:Tried to cut them up into equal pieces. Used the lines to create certain degrees and added them together. Maybe tried to cut the shapes into triangles to find the sum of the angles.

 3. Casey: Put a dot near the center of the shape and made them into triangles. Number of sides of the shape was the same as the #of triangles.

*Make as many observations as you can. Is there a relationship between the number of sides in the polygons and the angle measure?