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

luisz

what is the perimeter of triangle ABC?

  • one year ago
  • one year ago

  • This Question is Closed
  1. pitankar
    Best Response
    You've already chosen the best response.
    Medals 0

    sum of the three side's length.

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

    |dw:1347812022332:dw|

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

    tips?

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

    there is a 30-60-90 triangle, u know the property of this special triangle ??

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

    yes

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

    but I know none of the sides

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

    And I do not know the angles for the other triangle with sides

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

    I could assume that triangle ABC is a 30-60-90, right?

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

    C=30 degrees

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

    A=60 degrees

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

    B=90 degrees?

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

    calculate the length of perpendicular from A to BC using Pythagoras theorem. then use trigonometry relations to calculate AC. rest you can get...

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

    use pythagoras theorem to find the side...\|dw:1347812215548:dw|

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

    ahh

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

    good ol' pythagorean theorem

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

    so we have a 9-12-15 right triangle

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

    3-4-5?

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

    so the altitude becomes 12

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

    now AD = 12 can u find all sides ?

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

    30 degree side becomes 12 radical 3

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

    AC equals 24

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

    now

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

    15+24=39

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

    use pythagoras

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

    39+9=48

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

    48+12 radical 3?

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

    is that really it?

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

    No wonder this problem was so hard

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

    I never used pythagorean theorem

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

    derp

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

    u did this by yourself :)

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

    you have lots of geometry problem @luisz :p

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

    ty

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

    I know

    • 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.