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anonymous

  • one year ago

Can someone please help me ;~;

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    can you help me?

  3. anonymous
    • one year ago
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    @e.mccormick

  4. e.mccormick
    • one year ago
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    OK, so, what are some ways to prove two traingles are congruent? You want one of them as a goal.

  5. anonymous
    • one year ago
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    alright

  6. e.mccormick
    • one year ago
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    There are 5 ways. sss, sas, asa, aas, and hl. The last only applies in right triangles: http://www.regentsprep.org/regents/math/geometry/gp4/ltriangles.htm You need to move toward one of those. So you need to take what is given and show how it applies to parts of those, then use other rules to fill in mising bits. For example, it says D is the midpoint of AC. By the definiton of a midpoint that means AD = DC. So that means antyhing wih a side might use that.

  7. anonymous
    • one year ago
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    okat its starting to make sense but how to do i put that into proof , statements and reasons?

  8. e.mccormick
    • one year ago
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    "By definition, a midpoint of a line segment is the point on that line segment that divides the segment two congruent segments." from http://www.regentsprep.org/regents/math/geometry/gcg2/lmidpoint.htm As I said you use the definition of midpoint to prove that one. What other sides can you prove would have the same measure?

  9. anonymous
    • one year ago
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    um so i use the definition as my proof? cbd would have the same measurements

  10. e.mccormick
    • one year ago
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    You use the "definition of midpoint" for the reason for that one part, ad = dc cbd? Do you mean the angle? I asked about sides at this point.

  11. anonymous
    • one year ago
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    im confused on how to do this paper i dont get what your explaining i cant figure it out so i can write it down

  12. e.mccormick
    • one year ago
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    Well, like I said, you have only 5 ways you can prove two triangles are congruent. So you must prove each part of one of those 5, then you can prove that 5.

  13. anonymous
    • one year ago
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    okay i get that so for proof for the 1st one i put AD = DC

  14. e.mccormick
    • one year ago
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    Well, usually you start by listing the given you would use first. So you need "D us midpoint of AC" and "Given" Then for the 2nd one you can use AD = DC, definition of midpoint.

  15. anonymous
    • one year ago
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    proof is D is midpoint of Ac wait im so lost uggghhhhhhh how am i ever gonna finish this stupid paper

  16. e.mccormick
    • one year ago
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    It is just a couple more. See, there are three sides, right? And SSS is a proof of congruance. In two lines you just proved one side. So, how would you prove a second side?

  17. anonymous
    • one year ago
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    i dont know

  18. e.mccormick
    • one year ago
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    Well, what ese is given?

  19. anonymous
    • one year ago
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    CD?

  20. e.mccormick
    • one year ago
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    There are two givens and a diagram: ABC is isosceles D is the midpoint of AC. We already used "D is the midpoint of AC." so what can you get from "ABC is isosceles"

  21. anonymous
    • one year ago
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    BC

  22. e.mccormick
    • one year ago
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    BC is what?

  23. anonymous
    • one year ago
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    BC = AC?

  24. anonymous
    • one year ago
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    or A is the midpoint to BC

  25. e.mccormick
    • one year ago
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    No. Not BC = AC. Which sides on the diagram have the same mark?

  26. e.mccormick
    • one year ago
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    BC and...?

  27. anonymous
    • one year ago
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    BA?

  28. e.mccormick
    • one year ago
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    Yes. So the 3rd line is ABC is isosceles, given BC = BA, definition of isosceles

  29. e.mccormick
    • one year ago
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    Well, 3rd and 4th lines.

  30. e.mccormick
    • one year ago
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    OK, so that covers 2 of the sides. One more side and you prove SSS works. So what is the last side you need?

  31. anonymous
    • one year ago
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    DB?

  32. e.mccormick
    • one year ago
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    Yes. And DB is a shared side! So it is the same thing. There is a tecnical name for this: Reflexive Property of Equality http://www.mathwords.com/r/reflexive_property.htm The reflective property basically says that everything is itself. It is sstupid, but math actually has a rule to prove this! So the 5th line is: DB = DB, Reflexive Property of Equality

  33. anonymous
    • one year ago
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    is that it?

  34. e.mccormick
    • one year ago
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    One last line. The SSS line. ADB = CDB, SSS

  35. anonymous
    • one year ago
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    okay?

  36. e.mccormick
    • one year ago
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    And that is it. See, you prove each side, in this case, then say because the sides are = the triangles are =. So you prove each part then the whole. I'll give a plain language example.

  37. anonymous
    • one year ago
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    can you write all the lines out in order so first the proof then statements then reasons cause i cant figure out how to write that part

  38. anonymous
    • one year ago
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    i know it sounds like a pain but it would help me out

  39. e.mccormick
    • one year ago
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    I want to prove I have done my chores. I have a list of do dishes, make bed, and feed cat. I show that my bed is made. I show that the dishes are on the shelves so they mist have been done. I show that the cat bowl is empty... oops. Proves nothing! But I show the cat is happy and not hungry. So I must of fed the cat. All three things are done so the list must have been done. Proof I did my chores. That is what a proof is about. Showing how things have been done and are linked together. The lines for your proof are here, it this post. Just need to copy them in order.

  40. anonymous
    • one year ago
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    what?

  41. e.mccormick
    • one year ago
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    That is really what proofs are like. Just how you would prove to a parent that you did what you were told to do.

  42. anonymous
    • one year ago
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    but what parts do i use to make that proof your not telling me your using english for math and its confusing me .

  43. e.mccormick
    • one year ago
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    Well, from the top down in this post, when did I say things would be line(s) in your proof of triangles?

  44. anonymous
    • one year ago
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    no where

  45. e.mccormick
    • one year ago
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    I did several times...

  46. anonymous
    • one year ago
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    maybe but everything you explained is mixed up in different text and im confused and i asked you if you could straighten them out basically because im lost i wouldnt be asking otherwise.

  47. e.mccormick
    • one year ago
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    In those

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  48. anonymous
    • one year ago
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    okay .. can you help me make sure i got these right then?

  49. anonymous
    • one year ago
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    so the 1st one is AD = DC as the proof right?

  50. e.mccormick
    • one year ago
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    1) D is Midpoint of AC, Given 2) AD = DC, definition of midpoint

  51. anonymous
    • one year ago
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    Do you understand how i have to write this paper out as? Proof is one then, statements then, reasons

  52. e.mccormick
    • one year ago
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    Yes. That is why I put a comma.

  53. e.mccormick
    • one year ago
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    #) statement , reason

  54. anonymous
    • one year ago
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    that doesnt make sense there so 3 commas not 2? i need proof as well as statement and reason

  55. e.mccormick
    • one year ago
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    \( \begin{array}{lcl} Statements & \qquad & Reasons \\ \hline \text{D is the midpoint of AC} & \qquad & \text{Given} \\ AD = DC & \qquad & \text{Definition of midpoint} \\ \end{array} \)

  56. anonymous
    • one year ago
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  57. e.mccormick
    • one year ago
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    Yes. And I am trying to show how it would look when filled out.

  58. anonymous
    • one year ago
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    is my proof ABD = CBD

  59. anonymous
    • one year ago
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    i know but wheres the proof???

  60. e.mccormick
    • one year ago
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    Which is the LAST line. You build up to that.

  61. e.mccormick
    • one year ago
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    Those are the first two lines. There are six lines.

  62. anonymous
    • one year ago
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    okay can you write out a the lines? ive been trying to write them down and put it together but i cant get em right :/

  63. anonymous
    • one year ago
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    ive been working on this paper for days i need to get it done and its just making me upset more and more

  64. anonymous
    • one year ago
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    plus i cant figure out what the damn proof is

  65. e.mccormick
    • one year ago
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    Those are the only two that were not written out clearly. The first two. The 3rd, 4th, 5th, and 6th are all in that image: http://assets.openstudy.com/updates/attachments/55ef8588e4b0dedaa9edb1a4-e.mccormick-1441830203955-proof.png I did them as: Statment, reason ABC is isosceles, given They are all there.

  66. anonymous
    • one year ago
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    but whats the proof what do i write for proof please tell me im going to cry this is ridiculous i cant figure that part out

  67. e.mccormick
    • one year ago
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    As I said, it is right there, six lines. All six are typed out.

  68. anonymous
    • one year ago
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    k

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