It is evident that by this application of Problem VI. any given
rectilinear figure whatever in a horizontal plane may be drawn, since
any such figure may be divided into a number of triangles, and the
triangles then drawn in succession.
More convenient methods may, however, be generally found, according
to the form of the figure required, by the use of succeeding problems;
and for the quadrilateral figure which occurs most frequently in
practice, namely, the square, the following construction is more
convenient than that used in the present problem.