7. Circles seen in perspective appear as ellipses.
The ellipse may be
sized and placed in perspective by constructing it within a square.
The
reason the circle in perspective is drawn with the aid of the square is that
while there are no direct measurements on a curve, vanishing points are
easily determined for the square, and proportions of the curves can easily
be seen with the square.
Figure 2-8.
Layout for a circle in perspective
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