r
, a vertical were raised to the line E G, as in [Fig. 31.], and from the point where it cut E G a line were drawn to the vanishing-point, as Q Q′ in [Fig. 31.], this line would also determine two of the points of division.
Fig. 32.
If it is required to divide a circle into any number of given unequal parts (as in the points A, B, and C, [Fig. 33.]), the shortest way is thus to raise vertical lines from A and B to the side of the perspective square X Y, and then draw to the vanishing-point, cutting the perspective circle in
a
and
b