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eroshea
 2 years ago
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.
eroshea
 2 years ago
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.

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experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1could you draw a bit of figure?

eroshea
 2 years ago
Best ResponseYou've already chosen the best response.0i can't .. that is my problem, too..

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1353425869624:dw

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1353426012864:dw

eroshea
 2 years ago
Best ResponseYou've already chosen the best response.0so what i'm going to find is the theta??

eroshea
 2 years ago
Best ResponseYou've already chosen the best response.0Find the angle between side AB and its new position. what does this mean?

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1i guess that's the angle you are going to find ... can you find it?

eroshea
 2 years ago
Best ResponseYou've already chosen the best response.0i need further solution/explanation

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1353426445410:dw

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1\( \theta \) will be half of \( \alpha \)

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

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1yep .. should be around like that if you did it properly!!

eroshea
 2 years ago
Best ResponseYou've already chosen the best response.0aawww. can you explain it ?

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1looks 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

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