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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/unesp/360656
Title: 
The eye-pentagon construction
Author(s): 
Pegg Jr, Ed
Language: 
eng
Description: 
  • none
  • With a ruler and compass, an eye is easy to construct, leading to a regular pentagon construction. First draw a unit circle centered at O, the pupil. With centers at the top and bottom of the pupil, draw two circles of radius 2 to form the eyelids. Using the top of the pupil (A) as the center, draw an arc of radius 1 (AO) to intersect the upper eyelid at B. With C as the left corner of the eye, draw an arc with radius OC, and then a larger arc with radius BC. Draw a final arc with radius BC centered at O. Connect the intersection points for the pentagon
  • Componente Curricular::Ensino Fundamental::Séries Finais::Matemática
Issue Date: 
  • 11-Sep-2008
  • 2008
  • 11-Sep-2008
  • 11-Sep-2008
  • 9-Sep-2008
Keywords: 
  • Euclid's Elements
  • Golden Ratio
  • Greek Mathematics
  • Educação Básica::Ensino Fundamental Final::Matemática::Espaço e forma
Notes: 
Show the eye-pentagon construction
Credits: 
This demonstration needs the "MathematicaPlayer.exe" to run. Found in http://objetoseducacionais2.mec.gov.br/handle/mec/4737
Source: 
http://objetoseducacionais2.mec.gov.br/handle/mec/5268
URI: 
http://acervodigital.unesp.br/handle/unesp/360656
Rights: 
Demonstration freeware using Mathematica Player
Type: 
outro
Appears in Collections:MEC - Objetos Educacionais (BIOE) - OE

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