Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

AmberBamber

  • 2 years ago

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

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

    law of cosine is a general version of the pythag thrm

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

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

  3. amistre64
    • 2 years ago
    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

  4. AmberBamber
    • 2 years ago
    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.

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

    area*

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

    |dw:1359387445633:dw|

  7. AmberBamber
    • 2 years ago
    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)

  8. amistre64
    • 2 years ago
    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

  9. AmberBamber
    • 2 years ago
    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 :)

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

    good luck :)

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

    Thanks. :)

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

    • Attachments:

Ask your own question

Sign Up
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.