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Topic: Triangular dipyramid

	Triangular Dipyramid -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		Triangular Dipyramid -- Facts, Info, and Encyclopedia article
		In (The pure mathematics of points and lines and curves and surfaces) geometry, the triangular dipyramid is one of the (additional info and facts about Johnson solid) Johnson solids (solid #12).
		It is a three-dimensional solid that has (A three-sided regular polygon) equilateral triangles only as faces.
	www.absoluteastronomy.com /encyclopedia/t/tr/triangular_dipyramid.htm (122 words)

	Encyclopedia: Pyramid
		An n-sided pyramid is a polyhedron formed by connecting an n-sided polygonal base and a point, called the apex, by n triangular faces (nâ¥3).
		One of the Platonic solids, the tetrahedron, is a triangular pyramid.
		In chemistry, a trigonal pyramid is a molecular geometry with one atom at the apex and three atoms at the corners of a trigonal base.
	www.nationmaster.com /encyclopedia/Pyramid (3165 words)

	Square
		Gyroelongated square dipyramid In faces meeting and others have 5.
		Harvard Square Harvard Square is a large triangular area in the center of Boston, Cambridge, and other nearby cities.
		Triangular square number A triangular square number is a number which is both a infinity of triangular squares, given by...
	www.brainyencyclopedia.com /topics/square.html (3007 words)

	Polyhedron, Polyhedra, Polytopes, ... - Numericana
		After adding two edges to complete the two triangles whose sides are adjacent to the hinge, we are left with a nonplanar quadrilateral and must choose one of its 2 diagonals as the last edge of the polyhedron.
		One of them may be constructed by cutting off one of the 4 base corners of a square pyramid to create a new triangular face.
		dipyramid becomes if you twist its upper pyramidal cone 1/2n of a turn with respect to the lower one: The intersection of the two "cones" becomes a solid whose faces are quadrilaterals [see figure at right].
	home.att.net /~numericana/answer/polyhedra.htm (4643 words)

	Articles - Dice (Site not responding. Last check: 2007-10-21)
		Each face is kite-shaped; five of them meet at the same sharp corner (as at the top of the diagram in this row), and five at another equally sharp one; about halfway between them, a different group of three faces converges at each of ten blunter corners.
		An extremely rare type of die, the d3 is essentially a rounded-off triangular prism, intended to be rolled like a rolling-pin style die.
		The die is rounded-off at the edges to make it impossible for it to somehow land on the triangular sides, which makes it look a bit like a jewel.
	www.anfolk.com /articles/Dice (3974 words)

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