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26-07-2008, 10:12 PM
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#1 | ||
    Join Date: May 2005
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you said
Quote:
oops edit: actually i thought you mean something else with second line, nevermind
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Last edited by _r.u.s.s.; 26-07-2008 at 10:16 PM. |
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26-07-2008, 10:13 PM
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  Join Date: Mar 2006
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No, one could be 30 and the other 150 degrees. As for BC = CD, that doesn't guaranty a right angle either
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27-07-2008, 12:23 PM
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Quote:
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27-07-2008, 12:33 PM
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Join Date: Mar 2006
Location: Krakeroy, Norway
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That might very well be possible, seeing the lack of data for this particular psoblem. The interesting bit is to see how any difference between the two known angles influence the direction of the 4th line.
If they are both equal and do not equal to zero, then the 4th line is perpendicular to line c. If they are both equal and equal to zero, then the 4th line is at 0 or 180 degrees on the c line. If the angle BAC is greater than CAD, then the 4th line is at an angle "a" on the c line 90 < a < 180 If the angle BAC is smaller than CAD, then the 4th line is at an angle at the c line at 0 < a < 90 So, there is some sort of relationship here. The question is is it predictable and can it be calculated?
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27-07-2008, 12:55 PM
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Join Date: May 2005
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what you want to know are the angles only, right? and if you drag the E line further or closer it doesn't matter for angles, they stay the same, as long as BC=CD of course.
so you can pick any value for BC or CD. then it could be calculated
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27-07-2008, 01:06 PM
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Join Date: Feb 2005
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But e has no determined direction.
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27-07-2008, 01:18 PM
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For starter this is how I look @ trigonometry:
 Therefor your problem will look like the following in my opinion:  Now you end up wit 3 triangles.. (yes 3) Namely: ABC ; ACD & ABD To solve your issue I NEED (besides the known 3 angles @ A) Either 2 sides OR 1 additional angle AND 1 side. Or else there can't be a solution.
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Greetings from GTX2GvO. Member of The Victorious People's Shoutbox Liberation Army. |
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27-07-2008, 01:09 PM
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Join Date: Mar 2006
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Perhaps _r.u.s.s. is onto something. Like he says, the lengths AB, AC or AD doesn't change the angles I'm after, but once you fix one length, the others are set, even though they are still unknown.
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27-07-2008, 01:13 PM
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Join Date: May 2005
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luchsen it has, because there is only one possible way to place the line so the BC and DC are equal
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