Egyptens polyedrar

egyptens polyedrar
In geometry, a pyramid (from Ancient Greek πυραμίς (puramís)) [2] [3] is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base. A pyramid with an n-sided base has n + 1 vertices, n + 1 faces, and 2n edges. 1 avdelning 2 There are only five such polyhedra: Geometers have studied the Platonic solids for thousands of years. [1] They are named for the ancient Greek philosopher Plato who hypothesized in one of his dialogues, the Timaeus, that the classical elements were made of these regular solids. [2] History. 3 oktaeder 4 A polyhedron is a 3-dimensional example of a, a more general concept in any number of dimensions. Convex polyhedra are well-defined, with several equivalent standard definitions. However, the formal mathematical definition of polyhedra that are not required to be convex has been problematic. 5 Pyramids of Giza, Arabic Ahrāmāt Al-Jīzah, Giza also spelled Gizeh, three 4th- dynasty (c. –c. bce) pyramids erected on a rocky plateau on the west bank of the Nile River near Al-Jīzah (Giza) in northern Egypt. In ancient times they were included among the Seven Wonders of the World. 6 Also known as the five regular polyhedra, they consist of the tetrahedron (or pyramid), cube, octahedron, dodecahedron, and icosahedron. Pythagoras (c. –c. bc) probably knew the tetrahedron, cube, and dodecahedron. 7 pyramid med eder korsord 8 Hur upplevde du uppläsningen av pyramid? 9 Därefter använder vi detta språk för att definiera tredimensionella mång- hörningar, så kallade polyedrar. 10 tillhör tiggarorden 12