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        riddles >> easy >> Two Solids
        
(Message started by: THUDandBLUNDER on Jan 31^st, 2005, 1:13pm)

Title: Two Solids
Post by THUDandBLUNDER on Jan 31^st, 2005, 1:13pm

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?

Title: Re: Two Solids
Post by JocK on Jan 31^st, 2005, 1:32pm

[hide]

------------
\ . . . . . . . . \
\ . . . . . . . . \
------------
/| |\
/ .| |. \
/ . .| |. . \
\ . .| |. . /
\ .| |. /
\| |/
------------
/ . . . . . . . . /
/ . . . . . . . . /
------------
[/hide]
So I guess that makes ...[hide]5[/hide]...?

Title: Re: Two Solids
Post by Noke Lieu on Jan 31^st, 2005, 2:38pm

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... (http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_easy;action=display;num=1074966035;start=10)

Title: Re: Two Solids
Post by THUDandBLUNDER on Jan 31^st, 2005, 10:58pm

Oh dear! I missed that one completely.
Mods, feel free to erase this thread.
(Sorry, Jock.)

Title: Re: Two Solids
Post by JocK on Feb 1^st, 2005, 1:27pm

on 01/31/05 at 22:58:49, THUDandBLUNDER wrote:

Mods, feel free to erase this thread.
(Sorry, Jock.)

Aarrgggh..!! >:( ;D 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...

Title: Re: Two Solids
Post by THUDandBLUNDER on Feb 1^st, 2005, 1:35pm

Quote:

...as one cannot hide a JPG

But one can zip it.