A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

someone please explain how to solve this Given ΔABC, m∠A = 60°, b = 9 and c = 6. Find m∠B. Round to the nearest whole degree. A) 8° B) 41° C) 71° D) 79°

  • This Question is Open
  1. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    do you know the law of sines?

  2. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    its something like soh cah toa

  3. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you can only use that if you know it's a right triangle

  4. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    it is soh cah toa

  5. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    how about a/sinA=b/sinB=c/sinC

  6. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    but which side is which

  7. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont know theres no picture

  8. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so try soh can toa, do you know what it stands for? *tip: c usually= hypotenuse

  9. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    cah sorry not can

  10. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    well then why is b bigger than c

  11. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @tlatti

  12. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no i dont understand th esoh cah toa i looked it up and i dont understand

  13. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Sine Opposite Hypotenuse Cosine Adjacent Hypotenuse Tangent Opposite Adjacent

  14. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1433517992401:dw|

  15. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you do not know that this is a right angle so you cannot use the standard trig functions

  16. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what im so confused

  17. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    then what do i use

  18. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1433518102874:dw| the general triangle is drawn above

  19. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    how do you solve it

  20. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1433518184180:dw|

  21. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so FIRST use law of cosines to find a a^2 = b^2 + c^2 -2bc cosA then use law of sines a/sinA = b/sinB

  22. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    uhh can you show me?

  23. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    im still a little lost

  24. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @MrNood

  25. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The equations you need are above, and the values of a,b and A are given in the question and in my drawing this question is about cosine and sine rules use them to solve as described above FIRST solve a from cosine rule THEN solve B from sine rule

  26. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so for a i got 6210?

  27. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    given that the other 2 sides ar 6, & 9 is that a likely answer?

  28. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no thats y im so confused i dont know where im going wrong

  29. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    a^2 = b^2 + c^2 -2bc cosA you are trying to find a first write down what is b what is c what is cos A

  30. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    b is 9 9^2 is 81

  31. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    c is 6 6^2 36

  32. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ok good soo ... 2bc cosA =??

  33. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    cosA is 0.5

  34. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    2bc cosA= 2916?

  35. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    2* 9 * 6 * 0.5 =

  36. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    54

  37. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i thought we were supposed to use the squared number like 81 nd 36

  38. MrNood
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    a^2 = b^2 + c^2 -2bc cosA the squared numbers are part of it - but not in the 2bc cos A

  39. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so do i plug in the numbers to the equation? @MrNood

  40. 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.