A. The total surface area of site signage shall be the advertising area.

B. Advertising area means the total number of square feet within the boundaries of a parallelogram or triangle which encloses the message, work, symbol, design, picture or visual medium visible on the surface of any sign. For signs where single letters are located on separate surfaces facing the same direction, the advertising area shall be computed by adding together the advertising area of each separate letter. Where a sign includes surfaces facing in different directions, the advertising area shall be the largest total of advertising area visible from any one direction and in the case of a cylindrical or spherical-shaped sign, the advertising area shall be the diameter. The total advertising area shall include all on-site and off-premise signage for the use.