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  2. Pyramid (geometry) - Wikipedia

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

    The pyramid height is defined as the length of the line segment between the apex and its orthogonal projection on the base. Given that B {\displaystyle B} is the base's area and h {\displaystyle h} is the height of a pyramid, the volume of a pyramid is: [ 25 ] V = 1 3 B h . {\displaystyle V={\frac {1}{3}}Bh.}

  3. 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".

  4. Pyramid - Wikipedia

    en.wikipedia.org/wiki/Pyramid

    Pyramid of Khafre, Egypt, built c. 2600 BC. A pyramid (from Ancient Greek πυραμίς (puramís) 'pyramid') [1] [2] is a structure whose visible surfaces are triangular in broad outline and converge toward the top, making the appearance roughly a pyramid in the geometric sense.

  5. Solid angle - Wikipedia

    en.wikipedia.org/wiki/Solid_angle

    The solid angle of a four-sided right rectangular pyramid with apex angles a and b (dihedral angles measured to the opposite side faces of the pyramid) is = ⁡ (⁡ ⁡ ()). If both the side lengths ( α and β ) of the base of the pyramid and the distance ( d ) from the center of the base rectangle to the apex of the pyramid (the center of ...

  6. List of tallest pyramids - Wikipedia

    en.wikipedia.org/wiki/List_of_tallest_pyramids

    Possibly the largest pyramid by volume known to exist in the world today. [1] [2] Pyramid of the Sun: 65.5 216 AD 200 Teotihuacan, Mexico: Pyramid of Menkaure: 65 213 c. 2510 BC Giza, Egypt: Pyramid of Meidum: 65 213 c. 2600 BC Lower Egypt: 65 m tall after partial collapse; would have been 91.65 metres (300.7 ft). Pyramid of Djoser: 62.5 205 c ...

  7. Egyptian geometry - Wikipedia

    en.wikipedia.org/wiki/Egyptian_geometry

    The problem includes a diagram indicating the dimensions of the truncated pyramid. Several problems compute the volume of cylindrical granaries (41, 42, and 43 of the RMP), while problem 60 RMP seems to concern a pillar or a cone instead of a pyramid. It is rather small and steep, with a seked (slope) of four palms (per cubit). [10]

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  9. Seked - Wikipedia

    en.wikipedia.org/wiki/Seked

    Casing stone from the Great Pyramid. The seked of a pyramid is described by Richard Gillings in his book 'Mathematics in the Time of the Pharaohs' as follows: . The seked of a right pyramid is the inclination of any one of the four triangular faces to the horizontal plane of its base, and is measured as so many horizontal units per one vertical unit rise.