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  2. Pyramid (geometry) - Wikipedia

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

    In the case of a pyramid, its surface area is the sum of the area of triangles and the area of the polygonal base. The volume of a pyramid is the one-third product of the base's area and the height. The pyramid height is defined as the length of the line segment between the apex and its orthogonal projection on the base.

  3. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    In geometry, a tetrahedron (pl.: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertices. The tetrahedron is the simplest of all the ordinary convex polyhedra .

  4. List of mathematical shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_shapes

    Hyperbolic triangle (non-Euclidean geometry) Isosceles triangle; Kepler triangle; Reuleaux triangle; Right triangle; Sierpinski triangle (fractal geometry) Special right triangles; Spiral of Theodorus; Thomson cubic; Triangular bipyramid; Triangular prism; Triangular pyramid; Triangular tiling

  5. Category:Pyramids (geometry) - Wikipedia

    en.wikipedia.org/wiki/Category:Pyramids_(geometry)

    Pages in category "Pyramids (geometry)" The following 17 pages are in this category, out of 17 total. This list may not reflect recent changes. ...

  6. Pyramid - Wikipedia

    en.wikipedia.org/wiki/Pyramid

    The base of a pyramid can be of any polygon shape, such as triangular or quadrilateral, and its lines either filled or stepped. A pyramid has the majority of its mass closer to the ground [3] with less mass towards the pyramidion at the apex. This is due to the gradual decrease in the cross-sectional area along the vertical axis with increasing ...

  7. Bipyramid - Wikipedia

    en.wikipedia.org/wiki/Bipyramid

    In geometry, a bipyramid, dipyramid, or double pyramid is a polyhedron formed by fusing two pyramids together base-to-base.The polygonal base of each pyramid must therefore be the same, and unless otherwise specified the base vertices are usually coplanar and a bipyramid is usually symmetric, meaning the two pyramids are mirror images across their common base plane.

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