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cloaked_wolf
What's a life?
Joined: Thu Apr 23, 2009 8:46 pm
Posts: 10022
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Due to issues with the board, I've had to post my query as an IMG:  _________________ He fights for the users.
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| Tue Jul 27, 2010 5:08 pm |
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Fogmeister
I haven't seen my friends in so long
Joined: Thu Apr 23, 2009 7:35 pm
Posts: 6580
Location: Getting there
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Hmm...
OK...
Well...
I have to go out but I can work it out.
It'll have to be in a couple hours though.
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| Tue Jul 27, 2010 5:24 pm |
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Fogmeister
I haven't seen my friends in so long
Joined: Thu Apr 23, 2009 7:35 pm
Posts: 6580
Location: Getting there
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You know that beta and (OMG I can't remember the greek alphabet but the one that looks like a p) are the same angle.
I have to go now but I'm sure you can get some other similar angles out before trying to work anything out.
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| Tue Jul 27, 2010 5:30 pm |
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leeds_manc
I haven't seen my friends in so long
Joined: Thu Apr 23, 2009 8:19 pm
Posts: 5071
Location: Manchester
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ro
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| Tue Jul 27, 2010 5:46 pm |
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Fogmeister
I haven't seen my friends in so long
Joined: Thu Apr 23, 2009 7:35 pm
Posts: 6580
Location: Getting there
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I knew I was thinking too much.
There are infinitely many solutions to this. You pick the depth of the shelf and the height is given. It can be any depth over 4" and the height can be caluated.
No time to explain properly.
Will do later.
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| Tue Jul 27, 2010 5:57 pm |
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cloaked_wolf
What's a life?
Joined: Thu Apr 23, 2009 8:46 pm
Posts: 10022
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^^^I did wonder whether they were similar triangles or not.
_________________He fights for the users.
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| Tue Jul 27, 2010 6:15 pm |
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JJW009
I haven't seen my friends in so long
Joined: Thu Apr 23, 2009 6:58 pm
Posts: 8767
Location: behind the sofa
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The simplest solution is to make the shelf in the same ratio as the object, making all 4 triangles identical at 6 x 4. That gives side lengths of 6 x 2 = 12 and 4 x 2 = 8 No trig required  _________________jonbwfc's law: "In any forum thread someone will, no matter what the subject, mention Firefly." When you're feeling too silly for x404, youRwired.net
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| Tue Jul 27, 2010 6:28 pm |
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cloaked_wolf
What's a life?
Joined: Thu Apr 23, 2009 8:46 pm
Posts: 10022
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I kinda realised that after I did the calculations, which is why I asked for help.
Anyhoos, with some nifty tricks in excel I ended up with a table with varying lengths of a, which gave me varying lengths of Y.
The best solution for me is to make both X and Y = 10, that way the bloody block of wood will be symmetrical! What's more annoying is that I could have worked this out with a bit of trial and error, a ruler and a pen!
Sometimes I just overcomplicate things!
_________________He fights for the users.
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| Tue Jul 27, 2010 6:47 pm |
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dogbert10
Doesn't have much of a life
Joined: Thu Apr 23, 2009 8:23 pm
Posts: 638
Location: 3959 miles from the centre of the Earth - give or take a bit
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As you've already realised, there are multiple solutions - as X shortens, y increases and vice-versa. Only by fixing one of the other angles, x or y will you come to a single solution.
_________________
i7 860 @ 3.5GHz, GTX275, 4GB DDR3
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| Tue Jul 27, 2010 7:03 pm |
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cloaked_wolf
What's a life?
Joined: Thu Apr 23, 2009 8:46 pm
Posts: 10022
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It's one of those things where I need to fix a variable (as there were too many) and I started up by fixing delta as 90 degrees, even though I knew it wasn't and wouldn't work. The true value of delta was 67 degrees. _________________He fights for the users.
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| Tue Jul 27, 2010 7:30 pm |
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Fogmeister
I haven't seen my friends in so long
Joined: Thu Apr 23, 2009 7:35 pm
Posts: 6580
Location: Getting there
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In this case delta can be anything from about 10 degrees to about 170 degrees. But without fix one variable there are many possibilities.
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| Tue Jul 27, 2010 7:43 pm |
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