A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

tw101

  • one year ago

Using the law of cosines, in triangle RST, if r=14yd, s=9yd, t=6yd, find m<S

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

    do you know the formula for the law of cosines when finding an angle...?

  2. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    c^2=a^2+b^2/2abcos(

  3. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    whoops messed up

  4. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    c=a2+b2﹣2abcosγ

  5. jdoe0001
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    got picture?

  6. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    No, sorry. Thats all it gave me.:(

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

    close,this is what you need \[\cos(S) = \frac{r^2 + t^2 - s^2}{2 \times r \times s}\] plug the values in and calculate, the answer is a decimal less than 1. when you get the answer, you then then \[\\S = cos^{-1}(answer)\]

  8. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay. Ill plug it into my calculator. one sec.

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

    oops correction it should read \[\cos(S) = \frac{r^2 + t^2 -s^2}{2 \times r \times t}\]

  10. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay i got 151/168

  11. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    or .90

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

    great so the next step is \[S = \cos^{-1}(\frac{151}{168})\]

  13. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    26

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

    that was my solution

  15. tw101
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you so much!

  16. 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.