Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

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.

  • This Question is Closed
  1. experimentX
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    could you draw a bit of figure?

  2. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i can't .. that is my problem, too..

  3. experimentX
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1353425869624:dw|

  4. experimentX
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1353426012864:dw|

  5. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so what i'm going to find is the theta??

  6. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Find the angle between side AB and its new position. what does this mean?

  7. experimentX
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i guess that's the angle you are going to find ... can you find it?

  8. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i need further solution/explanation

  9. experimentX
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1353426445410:dw|

  10. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that is 90 degrees

  11. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i used cosine law

  12. experimentX
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \( \theta \) will be half of \( \alpha \)

  13. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    45 ?

  14. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the book's answer is 60 degrees.. but i find it 45 degrees.. how did it ended up with 60?

  15. experimentX
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yep .. should be around like that if you did it properly!!

  16. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    aawww. can you explain it ?

  17. experimentX
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 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

  18. eroshea
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    b^2 = a^2 + c^2 - 2ac cos theta that is cosine law right? and the answer is 90 degrees

  19. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.