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icosahedron    
n. 二十面体

二十面体

icosahedron
n 1: any polyhedron having twenty plane faces

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  • Icosahedron - Wikipedia
    In geometry, an icosahedron ( ˌaɪkɒsəˈhiːdrən, - kə -, - koʊ - or aɪˌkɒsəˈhiːdrən [1]) is a polyhedron with 20 faces The name comes from Ancient Greek εἴκοσι (eíkosi) 'twenty' and ἕδρα (hédra) 'seat' The plural can be either "icosahedra" ( - drə ) or "icosahedrons"
  • Icosahedron - Math is Fun
    For a regular icosahedron (where all faces are equilateral triangles): The name icosahedron comes from the Greek icosa- meaning 20, because it is a polyhedron with 20 faces When we have more than one icosahedron they are called icosahedra
  • Icosahedron - Cuemath
    The icosahedron's definition is derived from the ancient Greek words Icos (eíkosi) meaning 'twenty' and hedra (hédra) meaning 'seat' It is one of the five platonic solids with equilateral triangular faces
  • Icosahedron | Definition, Examples, Parts, Properties Nets
    An icosahedron has 30 edges—the angle between the edges of an icosahedron measures 60° The corners of an icosahedron, where the faces meet, are called vertices
  • Icosahedron – The Geometry of Thinking
    The icosahedron is distinguished from the other regular polyhedra in that it has an irrational volume both in tetrahedra and cubes Its isolation is further reinforced by its axes of spin and the 31 great circles they describe
  • Icosahedron - Math. net
    What is an icosahedron An icosahedron is a three-dimensional figure made up of only polygons One real life icosahedron example is a 20-sided die, also referred to as D20: The 20-sided die above is an example of a regular icosahedron, since all of its faces are made up of 20 equilateral triangles
  • Icosahedron -- from Wolfram MathWorld
    The (general) icosahedron is a 20-faced polyhedron (where icos- derives from the Greek word for "twenty" and -hedron comes from the Indo-European word for "seat")
  • Icosahedron: Definition, Properties Real-Life Examples - Vedantu
    An icosahedron is a three-dimensional geometric shape, specifically a polyhedron, that has exactly 20 faces In its most common form, the regular icosahedron, all faces are identical equilateral triangles
  • The 20-Sided Polygon: Icosahedron Explained Simply
    🚀 TL;DR – The 20-Sided Polygon Explained Simply An **icosahedron** is a **3D shape** with **20 triangular faces**, 30 edges, and 12 vertices—making it one of the most symmetrical **Platonic solids** Think of it as a **soccer ball’s cousin**, but with a smoother, mathematically perfect structure Whether you’re into **math, gaming, architecture, or even origami**, understanding this
  • Icosahedron - Virtual Math Museum
    When a newly created face becomes equilateral triangle, it is a icosahedron Wireframe shows edge truncated icosahedron, inside is its dual, which has 60 congruent quadrilateral faces (kites)





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