Given The Width Of An Octagon, To Find The Length Of A Side. (Fig. 63.)

Draw two parallel lines as far apart as the width of the octagon, generally using the inch scale. Use the figures 7 and 17, as described in Topic 40, B.

Another, and the more common method, is to construct a square on the given width of the octagon, and work from the diagonals, as described in Topic 40, D. (See Fig. 62.)