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  2. Maxwell's theorem (geometry) - Wikipedia

    en.wikipedia.org/wiki/Maxwell's_theorem_(geometry)

    Then the parallel to through ′, the parallel to through ′ and the parallel to through ′ intersect in a common point ′. The theorem is named after the physicist James Clerk Maxwell (1831–1879), who proved it in his work on reciprocal figures , which are of importance in statics .

  3. Intercept theorem - Wikipedia

    en.wikipedia.org/wiki/Intercept_theorem

    The intercept theorem, also known as Thales's theorem, basic proportionality theorem or side splitter theorem, is an important theorem in elementary geometry about the ratios of various line segments that are created if two rays with a common starting point are intercepted by a pair of parallels.

  4. Parallel postulate - Wikipedia

    en.wikipedia.org/wiki/Parallel_postulate

    Euclid gave the definition of parallel lines in Book I, Definition 23 [2] just before the five postulates. [3] Euclidean geometry is the study of geometry that satisfies all of Euclid's axioms, including the parallel postulate. The postulate was long considered to be obvious or inevitable, but proofs were elusive.

  5. Parallel axis theorem - Wikipedia

    en.wikipedia.org/wiki/Parallel_axis_theorem

    The parallel axis theorem, also known as Huygens–Steiner theorem, or just as Steiner's theorem, [1] named after Christiaan Huygens and Jakob Steiner, can be used to determine the moment of inertia or the second moment of area of a rigid body about any axis, given the body's moment of inertia about a parallel axis through the object's center of gravity and the perpendicular distance between ...

  6. Parallel (geometry) - Wikipedia

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

    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. Playfair's axiom - Wikipedia

    en.wikipedia.org/wiki/Playfair's_axiom

    Antecedent of Playfair's axiom: a line and a point not on the line Consequent of Playfair's axiom: a second line, parallel to the first, passing through the point. In geometry, Playfair's axiom is an axiom that can be used instead of the fifth postulate of Euclid (the parallel postulate):

  8. Pappus's hexagon theorem - Wikipedia

    en.wikipedia.org/wiki/Pappus's_hexagon_theorem

    If one considers a pappian plane containing a hexagon as just described but with sides and parallel and also sides and parallel (so that the Pappus line is the line at infinity), one gets the affine version of Pappus's theorem shown in the second diagram.

  9. Angle of parallelism - Wikipedia

    en.wikipedia.org/wiki/Angle_of_parallelism

    Angle of parallelism in hyperbolic geometry. In hyperbolic geometry, angle of parallelism () is the angle at the non-right angle vertex of a right hyperbolic triangle having two asymptotic parallel sides. The angle depends on the segment length a between the right angle and the vertex of the angle of parallelism.

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