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  2. Straightedge and compass construction - Wikipedia

    en.wikipedia.org/wiki/Straightedge_and_compass...

    The basic constructions. All straightedge-and-compass constructions consist of repeated application of five basic constructions using the points, lines and circles that have already been constructed. These are: Creating the line through two points; Creating the circle that contains one point and has a center at another point

  3. Geometric Constructions - Wikipedia

    en.wikipedia.org/wiki/Geometric_Constructions

    Geometric Constructions is a mathematics textbook on constructible numbers, and more generally on using abstract algebra to model the sets of points that can be created through certain types of geometric construction, and using Galois theory to prove limits on the constructions that can be performed.

  4. Constructible polygon - Wikipedia

    en.wikipedia.org/wiki/Constructible_polygon

    The first construction is due to Erchinger, a few years after Gauss's work. The first explicit constructions of a regular 257-gon were given by Magnus Georg Paucker (1822) [5] and Friedrich Julius Richelot (1832). [6] A construction for a regular 65537-gon was first given by Johann Gustav Hermes (1894). The construction is very complex; Hermes ...

  5. Geometrography - Wikipedia

    en.wikipedia.org/wiki/Geometrography

    Cover of Lemoine's "Géométrographie" In the mathematical field of geometry, geometrography is the study of geometrical constructions. [1] The concepts and methods of geometrography were first expounded by Émile Lemoine (1840–1912), a French civil engineer and a mathematician, in a meeting of the French Association for the Advancement of the Sciences held at Oran in 1888.

  6. Outline of geometry - Wikipedia

    en.wikipedia.org/wiki/Outline_of_geometry

    Geometry is one of the oldest mathematical sciences. Types, methodologies, and terminologies of geometry. ... The Strähle construction is used in the design of some ...

  7. Mohr–Mascheroni theorem - Wikipedia

    en.wikipedia.org/wiki/Mohr–Mascheroni_theorem

    A compass-only construction of doubling the length of segment AB. Given a line segment AB find a point C on the line AB such that B is the midpoint of line segment AC. [10] Construct point D as the intersection of circles A(B) and B(A). (∆ABD is an equilateral triangle.) Construct point E ≠ A as the intersection of circles D(B) and B(D).

  8. Constructible number - Wikipedia

    en.wikipedia.org/wiki/Constructible_number

    The square root of 2 is equal to the length of the hypotenuse of a right triangle with legs of length 1 and is therefore a constructible number. In geometry and algebra, a real number is constructible if and only if, given a line segment of unit length, a line segment of length | | can be constructed with compass and straightedge in a finite number of steps.

  9. Heptadecagon - Wikipedia

    en.wikipedia.org/wiki/Heptadecagon

    The explicit construction of a heptadecagon was given by Herbert William Richmond in 1893. The following method of construction uses Carlyle circles , as shown below. Based on the construction of the regular 17-gon, one can readily construct n -gons with n being the product of 17 with 3 or 5 (or both) and any power of 2: a regular 51-gon, 85 ...

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