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Formula for the Number of Diagonals in a Polygon
Triangle
How Many Diagonals in a Pentagon
Heptagon
How to Find the Number of Diagonals in an Octagon
Octagon
Formula for the Number of Sides in a Regular Polygon
Set Each Factor Equal To Zero
Part (b) What is the Sum of All of the Interior Angles of the Polygon?
Find the Measure of an Exterior Angle