angles of a polygon

How do the values in the "number of sides" column and "number of triangles" column relate?
What would be a formula for finding the sum of the interior angles of a convex polygon?
What is a regular polygon?
What would be a formula for finding each interior angle of a regular polygon?
Find the measure of each exterior angle of the two polygons.
What is the sum of the exterior angles of each polygon above?
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