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  2. Line segment - Wikipedia

    en.wikipedia.org/wiki/Line_segment

    A closed line segment includes both endpoints, while an open line segment excludes both endpoints; a half-open line segment includes exactly one of the endpoints. In geometry , a line segment is often denoted using an overline ( vinculum ) above the symbols for the two endpoints, such as in AB .

  3. Line (geometry) - Wikipedia

    en.wikipedia.org/wiki/Line_(geometry)

    The word line may also refer, in everyday life, to a line segment, which is a part of a line delimited by two points (its endpoints). Euclid's Elements defines a straight line as a "breadthless length" that "lies evenly with respect to the points on itself", and introduced several postulates as basic unprovable properties on which the rest of ...

  4. Hedgehog (geometry) - Wikipedia

    en.wikipedia.org/wiki/Hedgehog_(geometry)

    The astroid provides an example of a non-convex hedgehog. [5] The deltoid, an example of a projective hedgehog, showing line segments rotating through the family of lines whose envelope is the deltoid. An example of a projective hedgehog, defined from an anti-symmetric support function, is given by the deltoid curve.

  5. Arrangement of lines - Wikipedia

    en.wikipedia.org/wiki/Arrangement_of_lines

    A line arrangement in the projective plane differs from its Euclidean counterpart in that the two Euclidean rays at either end of a line are replaced by a single edge in the projective plane that connects the leftmost and rightmost vertices on that line, and in that pairs of unbounded Euclidean cells are replaced in the projective plane by ...

  6. Euclidean planes in three-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Euclidean_planes_in_three...

    A plane segment or planar region (or simply "plane", in lay use) is a planar surface region; it is analogous to a line segment. A bivector is an oriented plane segment, analogous to directed line segments. [a] A face is a plane segment bounding a solid object. [1] A slab is a region bounded by two parallel planes.

  7. Outline of geometry - Wikipedia

    en.wikipedia.org/wiki/Outline_of_geometry

    Desarguesian plane; Line at infinity; Point at infinity; Plane at infinity; Hyperplane at infinity; Projective line; Projective plane. Oval (projective plane) Roman surface; Projective space; Complex projective line; Complex projective plane; Fundamental theorem of projective geometry; Projective transformation. Möbius transformation; Cross ...

  8. Concurrent lines - Wikipedia

    en.wikipedia.org/wiki/Concurrent_lines

    The two bimedians of a quadrilateral (segments joining midpoints of opposite sides) and the line segment joining the midpoints of the diagonals are concurrent and are all bisected by their point of intersection. [3]: p.125 In a tangential quadrilateral, the four angle bisectors concur at the center of the incircle. [4]

  9. Skew lines - Wikipedia

    en.wikipedia.org/wiki/Skew_lines

    The line through segment AD and the line through segment B 1 B are skew lines because they are not in the same plane. In three-dimensional geometry, skew lines are two lines that do not intersect and are not parallel. A simple example of a pair of skew lines is the pair of lines through opposite edges of a regular tetrahedron.

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