Use less than, equal to, or greater than to complete this statement: the sum of the measures of the exterior angles of a regular 9-gon, one at each vertex, is the sum of the measures of the exterior angles of a regular 6-gon, one at each vertex.

The answer to the question above is "equal to". The exterior angles of different sided polygon may vary but their SUM is always equal for all polygon and that is equal to 360 degrees. Thus, the exterior angle is not dependent on the number of sides of a polygon. 

The lateral side of a triangular pyramid is a triangle. in order to increase the lateral surface area, the slant height and the height should be altered