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the center of the figure at the origin
-- Take the number of sides in the polygon. -- Subtract 2. -- Multiply the result by 180 degrees. -- You got it.
Subtract 1 from the number of vertices. Find the name of the polygon with that many sides. The pyramid has that polygon as its base. So, for example, 7 vertices. Subtract one and that gives 6. A six sided polygon is a hexagon. So the shape is a hexagon based (or hexagonal) pyramid.
It is a square which is a regular 4 sided polygon
If it is a regular polygon you count the number of sides. Subtract two and multiply that by 180. Then you would divide your product by however many sides there are