Results 1 to 4 of 4

Math Help - Did I do the following two column proof correctly?

  1. #1
    Newbie
    Joined
    Jul 2007
    Posts
    10

    Did I do the following two column proof correctly?

    Did I do the following two column proof correctly?-proof.gif

    Here' what I came up with:

    Given: \angle SRT = \angle STR; \angle 3 = \angle 4
    Prove: \angle 1 = \angle 2

    Statements:
    1. \angle SRT = \angle STR; \angle 3 = \angle 4

    2. \angle 1 + \angle 3 = \angle SRT; \angle = 2 + \angle 4 = \angle STR

    3. \angle 1 + \angle 3 = \angle 2 + \angle 4

    4. \angle 1 = \angle 2

    Reasoning:
    1. Given

    2. Angle addition postulate

    3. Addition property of equality

    4. Substitution



    Am I right?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Quick's Avatar
    Joined
    May 2006
    From
    New England
    Posts
    1,024
    All the steps I added have red numbers. The things I changed are in red as well.

    Statements:
    1. \angle SRT = \angle STR; \angle 3 = \angle 4

    2. \angle 1 + \angle 3 = \angle SRT; \angle 2 + \angle 4 = \angle STR

    3. \angle 2+\angle 4=\angle SRT

    4. \angle 1 + \angle 3 = \angle 2 + \angle 4

    5.
    \angle 1 +\angle 3 = \angle 2 +\angle 3

    6. \angle 1 = \angle 2

    Reasoning:
    1. Given

    2. Angle addition postulate

    3.
    Transitive property (or Substitution)

    4. Transitive Property (or Substitution)

    5. Substitution

    6. Subtraction property of equality
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor Quick's Avatar
    Joined
    May 2006
    From
    New England
    Posts
    1,024
    To other helpers:

    Does anyone else use the transitive property? Or was that just my teacher...
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Global Moderator

    Joined
    Nov 2005
    From
    New York City
    Posts
    10,616
    Thanks
    9
    Quote Originally Posted by Quick View Post
    Does anyone else use the transitive property?
    I use "transitive" because "substitution" is not well-defined for me.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: October 14th 2011, 08:59 PM
  2. question involving matrix row column rank proof
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: March 8th 2011, 07:28 AM
  3. Help with two column proof of a trapezoid
    Posted in the Geometry Forum
    Replies: 3
    Last Post: June 1st 2010, 02:41 AM
  4. Column and Null space proof!
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: November 27th 2009, 07:14 PM
  5. Replies: 2
    Last Post: October 27th 2008, 07:31 PM

Search Tags


/mathhelpforum @mathhelpforum