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Topic: Two Solids (Read 434 times) |
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ThudnBlunder
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The dewdrop slides into the shining Sea
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Two solids, a triangular pyramid and a square pyramid with a square base and four triangular sides, have edges that are all 1 metre long. If the models are placed together with a triangular face of each coinciding, how many faces does the resulting figure have?
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| « Last Edit: Jan 31st, 2005, 1:22pm by ThudnBlunder » |
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THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you.
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JocK
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Re: Two Solids
« Reply #1 on: Jan 31st, 2005, 1:32pm » |
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So I guess that makes ...5...?
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| « Last Edit: Jan 31st, 2005, 1:46pm by JocK » |
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solving abstract problems is like sex: it may occasionally have some practical use, but that is not why we do it.
xy - y = x5 - y4 - y3 = 20; x>0, y>0.
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Noke Lieu
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pen... paper... let's go! (and bit of plastic)
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Re: Two Solids
« Reply #2 on: Jan 31st, 2005, 2:38pm » |
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T&B, you're slipping, my friend... (am fairly sure was way, way back... the search is stalling on me, will come back later to see if it's working)
actually, not that long ago...
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| « Last Edit: Jan 31st, 2005, 2:48pm by Noke Lieu » |
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a shade of wit and the art of farce.
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ThudnBlunder
wu::riddles Moderator
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Re: Two Solids
« Reply #3 on: Jan 31st, 2005, 10:58pm » |
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Oh dear! I missed that one completely.
Mods, feel free to erase this thread.
(Sorry, Jock.)
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THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you.
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JocK
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Re: Two Solids
« Reply #4 on: Feb 1st, 2005, 1:27pm » |
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on Jan 31st, 2005, 10:58pm, THUDandBLUNDER wrote:Mods, feel free to erase this thread.
(Sorry, Jock.) |
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Aarrgggh..!!   It took me some 15 attempts to get the ASCII art correctly represented...  (I had to.... as one cannot hide a JPG it had to be a character-based picture.)
Funny to see that in the original thread no one came up with the idea to fold open the resulting polyhedron. I think the problem is surprisingly trivial if you do so in the correct way...
Nice little problem by the way...
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| « Last Edit: Feb 1st, 2005, 1:30pm by JocK » |
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solving abstract problems is like sex: it may occasionally have some practical use, but that is not why we do it.
xy - y = x5 - y4 - y3 = 20; x>0, y>0.
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ThudnBlunder
wu::riddles Moderator
Uberpuzzler
The dewdrop slides into the shining Sea
Gender:
Posts: 4489
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Re: Two Solids
« Reply #5 on: Feb 1st, 2005, 1:35pm » |
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Quote:| ...as one cannot hide a JPG |
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But one can zip it.
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THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you.
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