Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

AmberBamber

(Pre-cal: law of cosines) Find the area of the triangle. A=47 degrees b=32ft c=19 ft @amistre64

  • one year ago
  • one year ago

  • This Question is Closed
  1. amistre64
    Best Response
    You've already chosen the best response.
    Medals 1

    law of cosine is a general version of the pythag thrm

    • one year ago
  2. amistre64
    Best Response
    You've already chosen the best response.
    Medals 1

    in this case: a^2 = b^2 + c^2 - 2bc cosA

    • one year ago
  3. amistre64
    Best Response
    You've already chosen the best response.
    Medals 1

    when the angle given is 90 degrees this simplifies to: a^2 = b^2 + c^2 such that a is the hypotenuse

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

    Oh, so I need to find a before I can do s=a+b+c/2 and plug in for are.

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

    area*

    • one year ago
  6. amistre64
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1359387445633:dw|

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

    Then plug in s and the values of a, b, and c in the area formula. A=sqrts(s-a)(s-b)(s-c)

    • one year ago
  8. amistre64
    Best Response
    You've already chosen the best response.
    Medals 1

    if you want to do herons formula then yes, you would need to know all the side lengths

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

    Okay, well that's the only way I learned so I'm going to do it that way. But thank you! I needed a refresher :)

    • one year ago
  10. amistre64
    Best Response
    You've already chosen the best response.
    Medals 1

    good luck :)

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

    Thanks. :)

    • one year ago
    • Attachments:

See more questions >>>

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.