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A parabola (plural "parabolas"; Gray 1997, p. 45) is the set of all points in the plane equidistant from a given line L (the conic section directrix) and a given point F not ...

The locus of a point P (or the envelope of a line) fixed in relation to a curve C which slides between fixed curves. For example, if C is a line segment and P a point on the ...

The Buffon-Laplace needle problem asks to find the probability P(l,a,b) that a needle of length l will land on at least one line, given a floor with a grid of equally spaced ...

The digon is the degenerate polygon (corresponding to a line segment) with Schläfli symbol {2}.

A knot K embedded in R^3=C_z×R_t, where the three-dimensional space R^3 is represented as a direct product of a complex line C with coordinate z and a real line R with ...

A curve which intersects some straight line in an infinity of points (but for which not every point lies on this curve).

An optical illusion in which the orientation of arrowheads makes one line segment look longer than another. In the above figure, the line segments on the left and right are ...

The points on a line can be put into a one-to-one correspondence with the real numbers.

The roulette of the pole of a hyperbolic spiral rolling on a straight line is a tractrix.

A line segment where two faces of a polyhedron meet, also called a side.