Anti-parallel straight lines
From Encyclopedia of Mathematics
with respect to two given lines and
Two straight lines and
which intersect
and
so that
(cf. Fig.).
Figure: a012660a
If and
are anti-parallel with respect to
and
, then
and
are also anti-parallel with respect to
and
. In any quadrilateral inscribed in a circle, any two opposite sides are anti-parallel with respect to the other two sides. If the lines
and
intersect at a point
, one also says that
and
are anti-parallel with respect to the angle
. If the lines
and
coincide,
and
are said to be anti-parallel with respect to a straight line.
How to Cite This Entry:
Anti-parallel straight lines. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Anti-parallel_straight_lines&oldid=13704
Anti-parallel straight lines. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Anti-parallel_straight_lines&oldid=13704
This article was adapted from an original article by A.B. Ivanov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article