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UBA - CienciaS :: Ver Tema - dibujitos
UBA - CienciaS
http://ubacs.com.ar/ubacs/

dibujitos
http://ubacs.com.ar/ubacs/viewtopic.php?f=36&t=745
Página 1 de 1

Autor:  Gustav Mahler [ 12 Dic 2008, 10:36 ]
Asunto:  dibujitos

Hola. Tengo un problema divertido.

¿se puede dibujar un cubo en un papel, de forma que no se toquen las caras opuestas?

Saludos

Autor:  Agustin [ 12 Dic 2008, 12:45 ]
Asunto:  Re: dibujitos

Qué tal así?


Autor:  Quimey [ 12 Dic 2008, 23:50 ]
Asunto:  Re: dibujitos

no creo que eso califique de cubo...

Autor:  Gustav Mahler [ 13 Dic 2008, 00:24 ]
Asunto:  Re: dibujitos

buuuu!!!!

Yo decía algo así.

Adjuntos:
cubos.JPG
cubos.JPG [ 11.14 KiB | Visto 12547 veces ]

Autor:  Diana [ 15 Dic 2008, 16:48 ]
Asunto:  Re: dibujitos

asi vale?


Autor:  bel [ 16 Dic 2008, 19:08 ]
Asunto:  Re: dibujitos

yo creo que el problema es que ninguno de esos es un cubo-cubo.. no? son todos paralelepipedos o como se llamen pero no tienen todas sus caras iguales

Autor:  Gustav Mahler [ 18 Dic 2008, 08:04 ]
Asunto:  Re: dibujitos

La idea de "dibujar" es dibujar de cualquier forma que sea "representativa". las lineas no tienen por qué ser rectas, pero tienen que unir los puntos que tienen que unir.

El cubo de Diana está bueno.
Hay un punto que pertenece a las 4 caras, así que no anda como contraejemplo. Pero sí como ejemplo de otra cosa. Hay dos puntos "opuestos" del cuadrado que al dibujarlos sobre el papel, caen sobre el mismo lugar.
Esto me anima a preguntar: ¿pasa siempre?

¿no se puede dibujar un cubo de forma tal que no haya dos puntos opuestos sobre el mismo lugar?

Autor:  Gustav Mahler [ 18 Dic 2008, 08:20 ]
Asunto:  Re: dibujitos

Con un dodecahedro también!!

En el dibujo de la derecha pinto con colores iguales a las caras opuestas (el blanco es como transparente).
A la izquierda hay dos ejemplos. El punto rojo pertenece a dos caras opuestas.

Adjuntos:
dodec.jpg
dodec.jpg [ 20.94 KiB | Visto 12373 veces ]

Autor:  nachinchulin [ 13 Abr 2011, 23:59 ]
Asunto:  Re: dibujitos

Yo creo (y es de metido lo mío nomás) que al dibujar una figura lo que tenemos en cuenta es la escala en la que dibujamos pues.... si para mí ------------ese pedaso mide 1 en x -----ese pedaso mide 1 en y, entonces que importa que parezca un paralelepipedo? si la escala me dice que todo mide 1 (claro que en su respectiva coordenada), se entiende? estoy muy Herrado?

Autor:  ClaudiaGunkel [ 11 Dic 2016, 09:39 ]
Asunto:  Re: dibujitos


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