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  2. Straightedge and compass construction - Wikipedia

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

    In geometry, straightedge-and-compass construction – also known as ruler-and-compass construction, Euclidean construction, or classical construction – is the construction of lengths, angles, and other geometric figures using only an idealized ruler and a pair of compasses.

  3. 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 ...

  4. Geometric drawing - Wikipedia

    en.wikipedia.org/wiki/Geometric_drawing

    Geometric drawing made with ruler and compass. Geometric drawing consists of a set of processes for constructing geometric shapes and solving problems with the use of a ruler without graduation and the compass (drawing tool). [1] [2] Modernly, such studies can be done with the aid of software, which simulates the strokes performed by these ...

  5. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    Some regular polygons are easy to construct with compass and straightedge; other regular polygons are not constructible at all. The ancient Greek mathematicians knew how to construct a regular polygon with 3, 4, or 5 sides, [20]: p. xi and they knew how to construct a regular polygon with double the number of sides of a given regular polygon.

  6. Squaring the circle - Wikipedia

    en.wikipedia.org/wiki/Squaring_the_circle

    Squaring the circle is a problem in geometry first proposed in Greek mathematics.It is the challenge of constructing a square with the area of a given circle by using only a finite number of steps with a compass and straightedge.

  7. Euclidean geometry - Wikipedia

    en.wikipedia.org/wiki/Euclidean_geometry

    Euclidean geometry is a mathematical system attributed to ancient Greek mathematician Euclid, which he described in his textbook on geometry, Elements.Euclid's approach consists in assuming a small set of intuitively appealing axioms (postulates) and deducing many other propositions from these.

  8. Pentagon - Wikipedia

    en.wikipedia.org/wiki/Pentagon

    The Carlyle circle was invented as a geometric method to find the roots of a quadratic equation. [5] This methodology leads to a procedure for constructing a regular pentagon. The steps are as follows: [6] Draw a circle in which to inscribe the pentagon and mark the center point O. Draw a horizontal line through the center of the circle.

  9. 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.

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