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Math Help - Two column proof proving two line segments are congruent

  1. #1
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    Two column proof proving two line segments are congruent

    Here's the figure:

    Given that line AX is congruent to line DX, and line XB is congruent to line XB:
    Prove that line AC is congruent to line BD.
    Code:
     
    
           Statements                                                       Reasons
    
    1. Line Ax is congruent to Dx 1. Given 2. <AXD is congruent to <BXC 2. Vertical Angles Theorem 3. X is the midpoint of line AC 3. Definition of a Midpoint and line BD. 4. Line AC is congruent to line BD. 4. Definition of a Midpoint

    This is my try, I really don't think it's correct, so if somebody could help me out that would be cool.
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  2. #2
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    two column proof

    posted by rogereggbert

    i believe there is an error in your givens.Is the second given XB =XC If yes the figure is a parralellogram not a rectangle.It has two congruent triangles with the two legs you want to prove equal

    bj
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  3. #3
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    Quote Originally Posted by rogereggbert View Post
    Here's the figure:

    Given that line AX is congruent to line DX, and line XB is congruent to line XB:
    Prove that line AC is congruent to line BD.
    Code:
     
     
           Statements                                                       Reasons
    
    1. Line Ax is congruent to Dx 1. Given 2. <AXD is congruent to <BXC 2. Vertical Angles Theorem 3. X is the midpoint of line AC 3. Definition of a Midpoint and line BD. 4. Line AC is congruent to line BD. 4. Definition of a Midpoint
    This is my try, I really don't think it's correct, so if somebody could help me out that would be cool.

    Yeah, there is an error in the Given. But assuming that it's XB is congruent to XC, this is how I would do it.

    Statements Reasons
    1. AX is congruent to DX 1. Given.
    XB is congruent to XC

    2. Angles AXC and BXD are congruent. 2. Vertical angles are congruent.

    3. Triangles AXC and DXD are congruent. 3. SAS Postulate

    4. AC is congruent to BD. 4. Corresp. parts of congruent
    angles are congruent.

    Hope this helps! =)
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