As, if the point _b_ is first found, _V_ may be determined by it, so, if
the point _V_ is first found, _b_ may be determined by it. For let _AB_,
Fig. 10., be the given line, constructed upon the paper as in Fig. 8.;
and let it be required to draw the line _ab_ without using the point
_C′_.
[Illustration: Fig. 10.]