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Math Help - Parallel Lines

  1. #1
    Junior Member
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    Parallel Lines

    Show that AB is not parallel to CD in the diagram, giving all reasons.

    I am not certain of how I would set this out, could someone please help me?

    Thank you.
    Attached Thumbnails Attached Thumbnails Parallel Lines-angles5.jpg  
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  2. #2
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    The alternate interior angle theorem?
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