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eroshea
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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.
 2 years ago
 2 years 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.
 2 years ago
 2 years ago

This Question is Closed

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

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

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

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

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

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

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

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

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

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

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

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