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  2. Egyptian geometry - Wikipedia

    en.wikipedia.org/wiki/Egyptian_geometry

    No such tables have been found however. [11] Problem 18 of the MMP computes the area of a length of garment-cloth. [10] The Lahun Papyrus Problem 1 in LV.4 is given as: An area of 40 "mH" by 3 "mH" shall be divided in 10 areas, each of which shall have a width that is 1/2 1/4 of their length. [12]

  3. Pyramid of Khafre - Wikipedia

    en.wikipedia.org/wiki/Pyramid_of_Khafre

    The pyramid has a base length of 215.5 m (706 ft) or 411 cubits and rises up to a height of 136.4 metres (448 ft) or 274 cubits. It is made of limestone blocks weighing more than 2 tons each. The slope of the pyramid rises at a 53° 08' angle, steeper than its neighbor, the pyramid of Khufu , which has an angle of 51°50'24".

  4. Base (geometry) - Wikipedia

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

    A skeletal pyramid with its base highlighted. In geometry, a base is a side of a polygon or a face of a polyhedron, particularly one oriented perpendicular to the direction in which height is measured, or on what is considered to be the "bottom" of the figure. [1] This term is commonly applied in plane geometry to triangles, parallelograms ...

  5. Bent Pyramid - Wikipedia

    en.wikipedia.org/wiki/Bent_Pyramid

    In the third construction phase, the angle was reduced to 43° and, like in the Red Pyramid and all successive pyramids, the masonry was laid in horizontal layers. The slope reduction created the unique kink that is not found in any other pyramid. Due to the lower inclination angle of the upper part, the total height was reduced to 105 m.

  6. Reuleaux triangle - Wikipedia

    en.wikipedia.org/wiki/Reuleaux_triangle

    Among all shapes of constant width that avoid all points of an integer lattice, the one with the largest width is a Reuleaux triangle. It has one of its axes of symmetry parallel to the coordinate axes on a half-integer line. Its width, approximately 1.54, is the root of a degree-6 polynomial with integer coefficients. [17] [19] [20]

  7. History of geometry - Wikipedia

    en.wikipedia.org/wiki/History_of_geometry

    Geometry (from the Ancient Greek: γεωμετρία; geo- "earth", -metron "measurement") arose as the field of knowledge dealing with spatial relationships. Geometry was one of the two fields of pre-modern mathematics, the other being the study of numbers (arithmetic). Classic geometry was focused in compass and straightedge constructions.

  8. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    What condition on 12 angles is necessary and sufficient for them to be the 12 angles of some tetrahedron? Clearly the sum of the angles of any side of the tetrahedron must be 180°. Since there are four such triangles, there are four such constraints on sums of angles, and the number of degrees of freedom is thereby reduced from 12 to 8. The ...

  9. Geometry - Wikipedia

    en.wikipedia.org/wiki/Geometry

    In modern terms, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. [57] The size of an angle is formalized as an angular measure. In Euclidean geometry, angles are used to study polygons and triangles, as well as forming an object of study in their own right. [43]