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  2. Skew lines - Wikipedia

    en.wikipedia.org/wiki/Skew_lines

    Skew lines. Rectangular parallelepiped. 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 ...

  3. Line–line intersection - Wikipedia

    en.wikipedia.org/wiki/Lineline_intersection

    In Euclidean geometry, the intersection of a line and a line can be the empty set, a point, or another line. Distinguishing these cases and finding the intersection have uses, for example, in computer graphics, motion planning, and collision detection. In three-dimensional Euclidean geometry, if two lines are not in the same plane, they have no ...

  4. Coplanarity - Wikipedia

    en.wikipedia.org/wiki/Coplanarity

    Coplanarity. In geometry, a set of points in space are coplanar if there exists a geometric plane that contains them all. For example, three points are always coplanar, and if the points are distinct and non-collinear, the plane they determine is unique. However, a set of four or more distinct points will, in general, not lie in a single plane.

  5. Screw theory - Wikipedia

    en.wikipedia.org/wiki/Screw_theory

    Screw theory is the algebraic calculation of pairs of vectors, also known as dual vectors[ 1 ] – such as angular and linear velocity, or forces and moments – that arise in the kinematics and dynamics of rigid bodies. [ 2 ][ 3 ] Screw theory provides a mathematical formulation for the geometry of lines which is central to rigid body dynamics ...

  6. Parallel (geometry) - Wikipedia

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

    Line art drawing of parallel lines and curves. In geometry, parallel lines are coplanar infinite straight lines that do not intersect at any point. Parallel planes are planes in the same three-dimensional space that never meet. Parallel curves are curves that do not touch each other or intersect and keep a fixed minimum distance.

  7. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    The tetrahedron is one kind of pyramid, which is a polyhedron with a flat polygon base and triangular faces connecting the base to a common point. In the case of a tetrahedron, the base is a triangle (any of the four faces can be considered the base), so a tetrahedron is also known as a "triangular pyramid".

  8. Glossary of classical algebraic geometry - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_classical...

    Intersecting in a set that is either empty or of the "expected" dimension. For example skew lines in projective 3-space do not intersect, while skew planes in projective 4-space intersect in a point. solid A 3-dimensional linear subspace of projective space, or in other words the 3-dimensional analogue of a point, line, or plane.

  9. Paraboloid - Wikipedia

    en.wikipedia.org/wiki/Paraboloid

    Paraboloid. In geometry, a paraboloid is a quadric surface that has exactly one axis of symmetry and no center of symmetry. The term "paraboloid" is derived from parabola, which refers to a conic section that has a similar property of symmetry. Every plane section of a paraboloid by a plane parallel to the axis of symmetry is a parabola.

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