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eroshea
Group Title
An isosceles triangle ABC, in which AB=BC=6 root 2 and AC=12 is folded along the altitude BD so that planes ABD and BDC form a right dihedral angle. Find the angle between side AB and its new position.
 one year ago
 one year ago
eroshea Group Title
An isosceles triangle ABC, in which AB=BC=6 root 2 and AC=12 is folded along the altitude BD so that planes ABD and BDC form a right dihedral angle. Find the angle between side AB and its new position.
 one year ago
 one year ago

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experimentX Group TitleBest ResponseYou've already chosen the best response.1
could you draw a bit of figure?
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
i can't .. that is my problem, too..
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
dw:1353425869624:dw
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
dw:1353426012864:dw
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
so what i'm going to find is the theta??
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
Find the angle between side AB and its new position. what does this mean?
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
i guess that's the angle you are going to find ... can you find it?
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
i need further solution/explanation
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
dw:1353426445410:dw
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
that is 90 degrees
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
i used cosine law
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
\( \theta \) will be half of \( \alpha \)
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
the book's answer is 60 degrees.. but i find it 45 degrees.. how did it ended up with 60?
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
yep .. should be around like that if you did it properly!!
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
aawww. can you explain it ?
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
looks like you did it right http://www.wolframalpha.com/input/?i=12^2+%3D+2%286+sqrt%282%29%29^2++2+*+%286+sqrt%282%29%29^2+cos%28x%29
 one year ago

eroshea Group TitleBest ResponseYou've already chosen the best response.0
b^2 = a^2 + c^2  2ac cos theta that is cosine law right? and the answer is 90 degrees
 one year ago
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