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geometry [2021/05/14 02:44] – created agageometry [2021/09/06 12:42] (current) – [Revolutions] rapidplatypus
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 ==== Icosahedron ==== ==== Icosahedron ====
-An icosahedron has 20 faces in the shape of congruent equilateral triangles, 30 edges and 12 vertices, and 15 planes of symmetry. By shearing the vertices of the icosahedron, we obtain a semi-formal polyhedron called the truncated icosahedron. [([[https://study.com/academy/lesson/what-is-an-icosahedron-definition-facts.html|Study]])]+An icosahedron has 20 faces in the shape of congruent equilateral triangles, 30 edges, 12 vertices and 15 planes of symmetry. By shearing the vertices of the icosahedron, we obtain a semi-formal polyhedron called the truncated icosahedron. [([[https://study.com/academy/lesson/what-is-an-icosahedron-definition-facts.html|Study]])]
  
-==== Everywhere is North ====+==== Everywhere is north ====
 Which direction can we not look while standing at the South Pole? Neither east, nor west, nor south. At the South Pole, every direction is north. [([[https://www.antarctica.gov.au/about-antarctica/geography-and-geology/geography/poles-and-directions/|Antarctica]])] Which direction can we not look while standing at the South Pole? Neither east, nor west, nor south. At the South Pole, every direction is north. [([[https://www.antarctica.gov.au/about-antarctica/geography-and-geology/geography/poles-and-directions/|Antarctica]])]
  
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 ==== Revolutions ==== ==== Revolutions ====
-The hour hand makes 2 revolutions per day, while the minute hand makes 24 revolutions - so it passes the hour hand 22 times. To put it another way: during each hour the hands pass each other once, except for 11:00-12:00 and 23:00-24:00 when the minute hand "catches up" with the hour hand at the end of the hour. [([[https://nrich.maths.org/590/solution|Maths]])]+A clock's hour hand makes two revolutions per day, while the minute hand makes 24 revolutions — so it passes the hour hand 22 times. To put it another way, during each hour the hands pass each other once, except for 11:00-12:00 and 23:00-24:00 hours, when the minute hand "catches up" with the hour hand at the end of the hour. [([[https://nrich.maths.org/590/solution|Maths]])]
  
 ==== Ellipsoid ==== ==== Ellipsoid ====
 An ellipsoid is a surface whose planar sections are all ellipses. Sometimes this word is also used to describe a solid bounded by this surface. An example of an ellipsoid is a rugby ball. [([[https://www.web-formulas.com/Math_Formulas/Geometry_Volume_of_Ellipsoid.aspx|Web Formulas]])] An ellipsoid is a surface whose planar sections are all ellipses. Sometimes this word is also used to describe a solid bounded by this surface. An example of an ellipsoid is a rugby ball. [([[https://www.web-formulas.com/Math_Formulas/Geometry_Volume_of_Ellipsoid.aspx|Web Formulas]])]
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 +{{tag>science math}}
geometry.1620978275.txt.gz · Last modified: by aga

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