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  2. Square pyramid - Wikipedia

    en.wikipedia.org/wiki/Square_pyramid

    In geometry, a square pyramid is a pyramid with a square base, having a total of five faces. If the apex of the pyramid is directly above the center of the square, it is a right square pyramid with four isosceles triangles ; otherwise, it is an oblique square pyramid .

  3. Pyramid (geometry) - Wikipedia

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

    The volume of a pyramid was recorded back in ancient Egypt, where they calculated the volume of a square frustum, suggesting they acquainted the volume of a square pyramid. [30] The formula of volume for a general pyramid was discovered by Indian mathematician Aryabhata , where he quoted in his Aryabhatiya that the volume of a pyramid is ...

  4. Square pyramidal number - Wikipedia

    en.wikipedia.org/wiki/Square_pyramidal_number

    A square pyramid of cannonballs at Rye Castle in England 4900 balls arranged as a square pyramid of side 24, and a square of side 70. The cannonball problem asks for the sizes of pyramids of cannonballs that can also be spread out to form a square array, or equivalently, which numbers are both square and square pyramidal. Besides 1, there is ...

  5. Pyramidal number - Wikipedia

    en.wikipedia.org/wiki/Pyramidal_number

    Geometric representation of the square pyramidal number 1 + 4 + 9 + 16 = 30. A pyramidal number is the number of points in a pyramid with a polygonal base and triangular sides. [1] The term often refers to square pyramidal numbers, which have a square base with four sides, but it can also refer to a pyramid with any number of sides. [2]

  6. Cannonball problem - Wikipedia

    en.wikipedia.org/wiki/Cannonball_problem

    A square pyramid of cannonballs in a square frame. In the mathematics of figurate numbers, the cannonball problem asks which numbers are both square and square pyramidal.The problem can be stated as: given a square arrangement of cannonballs, for what size squares can these cannonballs also be arranged into a square pyramid.

  7. List of Johnson solids - Wikipedia

    en.wikipedia.org/wiki/List_of_Johnson_solids

    Equilateral square pyramid: 5 8 5 of order 8 = (+) = 2 Pentagonal pyramid: 6 10 6 ...

  8. Play Just Words Online for Free - AOL.com

    www.aol.com/games/play/masque-publishing/just-words

    If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online!

  9. Egyptian pyramids - Wikipedia

    en.wikipedia.org/wiki/Egyptian_pyramids

    The Egyptian pyramids are ancient masonry structures located in Egypt. ... The Pyramid of Djoser was first built as a square mastaba-like structure, ...