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  2. Cubic pyramid - Wikipedia

    en.wikipedia.org/wiki/Cubic_pyramid

    In 4-dimensional geometry, the cubic pyramid is bounded by one cube on the base and 6 square pyramid cells which meet at the apex. Since a cube has a circumradius divided by edge length less than one, [ 1 ] the square pyramids can be made with regular faces by computing the appropriate height.

  3. Mass–energy equivalence - Wikipedia

    en.wikipedia.org/wiki/Mass–energy_equivalence

    Mass–energy equivalence states that all objects having mass, or massive objects, have a corresponding intrinsic energy, even when they are stationary.In the rest frame of an object, where by definition it is motionless and so has no momentum, the mass and energy are equal or they differ only by a constant factor, the speed of light squared (c 2).

  4. Cubical bipyramid - Wikipedia

    en.wikipedia.org/wiki/Cubical_bipyramid

    In 4-dimensional geometry, the cubical bipyramid is the direct sum of a cube and a segment, {4,3} + { }. Each face of a central cube is attached with two square pyramids, creating 12 square pyramidal cells, 30 triangular faces, 28 edges, and 10 vertices.

  5. Pyraminx - Wikipedia

    en.wikipedia.org/wiki/Pyraminx

    Pyraminx in its solved state. The Pyraminx (/ ˈ p ɪ r ə m ɪ ŋ k s /) is a regular tetrahedron puzzle in the style of Rubik's Cube.It was made and patented by Uwe Mèffert after the original 3 layered Rubik's Cube by Ernő Rubik, and introduced by Tomy Toys of Japan (then the 3rd largest toy company in the world) in 1981.

  6. Square pyramidal number - Wikipedia

    en.wikipedia.org/wiki/Square_pyramidal_number

    These numbers can be calculated algebraically, as follows. If a pyramid of spheres is decomposed into its square layers with a square number of spheres in each, then the total number of spheres can be counted as the sum of the number of spheres in each square, = = = + + + +, and this summation can be solved to give a cubic polynomial, which can be written in several equivalent ways

  7. Pyraminx Duo - Wikipedia

    en.wikipedia.org/wiki/Pyraminx_Duo

    The above table shows that the God's Number of the Pyraminx Duo is 4 (i.e. the puzzle is always at most 4 twists away from its solved state). Similarly to the total number of combinations, this number is very low compared to the Rubik's Cube (20), the Pocket Cube (11) or the Pyraminx (11, excluding the trivial tips).

  8. Pyramorphix - Wikipedia

    en.wikipedia.org/wiki/Pyramorphix

    Four of the cube's corners are reshaped into pyramids and the other four are reshaped into triangles. The result of this is a puzzle that changes shape as it is turned. The original name for the Pyramorphix was "The Junior Pyraminx." This was altered to reflect the "Shape Changing" aspect of the puzzle which makes it appear less like the 2×2× ...

  9. Mechanical puzzle - Wikipedia

    en.wikipedia.org/wiki/Mechanical_puzzle

    A pyramid puzzle consists of two or more component pieces which fit together to create a pyramid. [1] [2] Two-piece pyramid puzzles cannot form a regular pyramid and can only form a 4 faced tetrahedron pyramid. The solution involves facing the square faces to each other and twisting one upright to complete the four faced tetrahedronic pyramid. [3]