Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

space4cadet101

  • 2 years ago

I have a Geometry question if anybody can help!! :) thnx!!!

  • This Question is Closed
  1. shubhamsrg
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    welcome!!!

  2. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    In triangle DEF, what is the length of DF?

    1 Attachment
  3. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    here is the question.....i am not really sure how to do it??

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

    Well, for starters, DF is the hypotenuse of this right triangle, right? :)

  5. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes!!

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

    Yes... let's redraw this figure, but only including the relevant stuff... |dw:1362665968423:dw| Now, with respect to the sixty degree angle, what is the side measuring 45?

  7. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I am not really sure I would think the other angle down below would be 30 degrees if there was one?? I would guess it would be 30 square root of three??

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

    Hang on :) Is this side... |dw:1362666135050:dw| Opposite to the 60 degree angle? Is it adjacent to it?

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

    Oh wait, it seems like you already got the answer down...

  10. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    wait what??

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

    Okay, forget what I said. Do you use sines and cosines already? :D

  12. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes I did but can you give me the math part of the equation like how to do it?? I mean I think I know how to do it but I need someone to just write out how they did the equation! if that makes any since??

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

    Okay, you want to use sines and cosines, or just the properties of the so-called 30-60-90 triangles?

  14. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    YES!!!

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

    Yes, what? I gave you a choice :P

  16. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oo sorry I only looked at the last one which is 30-60-90 traingles that is what i wanted

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

    LOL OK :) so... suppose we have a 30-60-90 triangle |dw:1362666525444:dw|

  18. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    okay :)

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

    Now, if one side measures...|dw:1362666670884:dw| This is the side opposite the 30-degree angle, right?

  20. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes!

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

    Well, in this case..., the angle opposite the 60-degree angle would measure... |dw:1362666746027:dw| And the hypotenuse would measure

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

    |dw:1362666784331:dw|

  23. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    umm....well I guess 45??

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

    What? I didn't ask you anything yet... :P But yeah, you're given the side opposite the 60 degree angle, so that's 45. And this is equal to x sqrt(3) So... \[\large 45=x\sqrt3\] Now solve for x. Actually, solve for 2x, since that's the measure of the hypontenuse.

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

    *hypotenuse

  26. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    wait this is were I get confused is adding them up!!

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

    Okay, slowly... \[45=x\sqrt3\]Now multiply both sides by 2 \[90=2x\sqrt3\]Now divide both sides by sqrt(3) \[\large \frac{90}{\sqrt{3}}=2x\]And rationalise the denominator... \[\large \frac{90\sqrt{3}}{3}=2x\]\[\huge 30\sqrt3=2x\]And so you were right the first time :D

  28. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    okay wow that is really nice of you to write all of that out for me :) thank you so much!! I will give you a medal for all of your help!! thank you :) have a great day!!

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

    No problem :)

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

    But make sure you got how to do this... it's really a rewarding feeling, solving one type of problem for the first time on your own... real satisfying :)

  31. space4cadet101
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah!! I will write down those steps you gave me and use them in the future!! thank you :)

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

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.