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A triangle that becomes a ...
If we take an isosceles triangle with a big abtuse angle, and attach the two slanting side...
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Building up surfaces
From the point of view of topology, this pipe, that has been taken from a spare part of a ...
With a pipe taken from a spare part of a car we can make a torus.
From the topological point of view, a belt is an example of cylinder; if we tie it on the ...
Pipes and connectors to build up surfaces.
Tying and untying a sleeve
With the sleeve of a wind-cheater that can be tied and untied we can imitate the topologic...
Ribbons for curtains
From the point of view of topology, the ribbons for curtains are an example of cylinder.
From the point of view of topology, a pair of trousers is a sphere with three holes; we c...
surfaces around the world
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