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- The eye-pentagon construction
- Pegg Jr, Ed
- 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
- Euclid's Elements
- Golden Ratio
- Greek Mathematics
- Educação Básica::Ensino Fundamental Final::Matemática::Espaço e forma
- Show the eye-pentagon construction
- This demonstration needs the "MathematicaPlayer.exe" to run. Found in http://objetoseducacionais2.mec.gov.br/handle/mec/4737
- Demonstration freeware using Mathematica Player
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