A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Proportionality Theorem I have the first column of the proof I just need help with the second.

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

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

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

    @jim_thompson5910

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

    the first two are most likely incorrect

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

    Any ideas? :/

  6. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    why do you think the first two are incorrect?

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

    I am over all unsure about proofs. I am horrible when it comes to them

  8. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    see attached

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

    oh wow.

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

    guess I was right :p

  11. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    right in that the first two lines of the 2 column proof are incorrect? Or that they are correct?

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

    They are correct. :p

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

    2 down 4 more lines to figure out .-.

  14. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    why is angle ABC congruent to angle ADE ?

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

    I dont know. because they're congruent angles?

  16. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    That's circular reasoning and flawed. You cannot make a statement and then back up that statement with the same statement.

  17. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    see this page https://www.mathsisfun.com/geometry/parallel-lines.html

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

    ugh. I hate proofs. Does it have to do with Bisectors?

  19. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    go ahead and look through the link I posted be sure to play with the interactive applet

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

    They're corresponding angles?

  21. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    very good

  22. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1433203991985:dw|

  23. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1433204002334:dw|

  24. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what about the next line?

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

    one sec lemme fill in the third

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

    Alrighty. give me a second to look on that link

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

    this one confuses me.. possibly consecutive interior angles?

  28. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    why?

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

    theres angles in and outside.. kind of.

  30. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1433204262730:dw|

  31. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    we are given that DE || BC |dw:1433204337699:dw|

  32. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    and as you pointed out \[\Large \sphericalangle ABC \cong \sphericalangle ADE\] because they are corresponding angles |dw:1433204439413:dw|

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

    Alright...

  34. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The same applies for angle ACB and angle AED \[\Large \sphericalangle ACB \cong \sphericalangle AED\] because they are corresponding angles |dw:1433204518237:dw|

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

    soo corresponding angles again?

  36. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    correct

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

    Now the 5th line to me makes no sense its like a triangle then a segment

  38. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oops typo

  39. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    let me fix

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

    i see what you mean. oops. aha

  41. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

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

    Intersecting Chords Theorem?

  43. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    nope

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

    so many theorems.

  45. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    http://www.regentsprep.org/regents/math/geometry/gp11/LsimilarProof.htm

  46. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    keep in mind that the 2 column proof builds up to what we want to aim for. Each step/line is necessary in getting to where we want to go

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

    AA?

  48. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yep, Angle Angle |dw:1433205268084:dw|

  49. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1433205298484:dw|

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

    Ohh.

  51. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so we have a pair of congruent corresponding angles, therefore that's why \(\large \triangle ABC \sim \triangle DBA\) is true (because of the AA similarity theorem)

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

    I see what you mean.

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

    then what about the last one?

  54. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    any thoughts on it?

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

    I mean. I see how they relate. corresponding sides?

  56. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    how can we use line 5 to lead up to line 6 ?

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

    Honestly I have no idea.

  58. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    if you look through these theorems http://www.regentsprep.org/regents/math/geometry/gp11/LsimilarProof.htm which theorem deals with proportions?

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

    SSS!!!(:

  60. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes specifically the converse of the SSS similarity theorem

  61. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    the SSS similarity theorem if the sides are all in proportion (as shown in the fractions), then the triangles are similar

  62. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    converse of the SSS similarity theorem if the triangles are similar, then the sides form a proportion

  63. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    the converse is the "backwards" version of the original, so to speak

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

    I see. so does this look good?

    1 Attachment
  65. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    it's not just SSS theorem, it's the converse of that theorem

  66. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    everything else looks good though

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

    so write converse sss theorem?

  68. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah or something like that so the teacher knows

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

    BTW this isn't a test or quiz or anything.. I see alot of students ask for answers on here.

  70. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ok I hope that it's not. Those sorts of things should be taken individually without any help. If anything, they should be proctored.

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

    Anyways Thank you for the help!! It means the world!

  72. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you're welcome

  73. 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.