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Prove that d||d'

  1. Nov 14, 2007 #1
    hi,could u plz help me with this Geometrical problem?
    in this figure prove that : d||d'
    Heres the figure:
    as u see A=90 and so is A'

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    Last edited: Nov 14, 2007
  2. jcsd
  3. Nov 15, 2007 #2


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    What do you have to work with? That is, what theorems about parallel lines do you know and can use? For example do you know "If 'corresponding angles' formed by a transversal crossing two lines are congruent, then the lines are parallel"? Or "If 'alternate interior angles' formed by a transversal crossing to lines are congruent then the lines are parallel"? If you know those, then you should be able to apply one to this problem.
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