4 articles trouvés pour ce sujet.
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Un polyedre ayant comme face 20 triangles |
2000-08-02 |
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Sonia pose la question :
J'aimerai savoir comment s'appelle un polyedre ayant comme face 20 triangles équilatéraux égaux.
Chris Fisher lui répond. |
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The inradius of an icosahedron |
2010-01-21 |
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fnavroth pose la question :
Suppose you have an equilateral triangle.
The area of the triangle is exactly 1200 square centimetres.
Now suppose you have twenty of those triangles.
It's possible to assemble those twenty triangles into a closed
three-dimensional shape, a regular polyhedron.
What would be the volume, in cubic centimetres, of the largest sphere
that could fit inside the shape?
Chris Fisher lui répond. |
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The radius of a soccor ball |
2006-05-05 |
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Jacqui pose la question :
A soccer ball is made up of hexagons and pentagons with the same side lengths.
A manufacturer wants to produce a ball of certain diameter. The questions that follows is what side length for the polygons will produce a ball of certain diameter.
Chris Fisher lui répond. |
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Platonic Solids Surface Area |
1998-12-02 |
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Rachel Bidwell pose la question :
How do you find the surface area of the 5 platonic solids, when they each have a volume of one cubic inch
Harley Weston lui répond. |
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