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Math Help - Co interior, alternate and corresponding angles.

  1. #1
    Junior Member
    Joined
    Jan 2011
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    Co interior, alternate and corresponding angles.

    Hi,

    In grade 8 we are learning of the above angles. I understand it briefly e.g what an alternate angle is...

    What I don't understand is the reasons.

    E.G
    She would give us a pic like this:

    Google Image Result for http://www.mathsteacher.com.au/year8/ch09_geometry/01_geom/Image13351.gif



    But our pic would have the degree of one angle. e.g y= 60

    She would then tell us to work out x. That is easy. 180-60=x
    But then she tells us to give a reason and she says the reason will be: adjacent angles on a straight line. What I don't get, are the reasons for co interior and corresponding angles.

    E.G She would give us a pic like this Google Image Result for http://www.mathleague.com/help/geometry/IMG00046.gif

    But give us the value of C D and B and say work out A. She would then say. Give a reason for why you say that. Also, how would I work that out? I know the answer in my head, but need to show working out.
    Help would be appreciated!

    Thanks.
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  2. #2
    Super Member
    Joined
    Nov 2007
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    Trumbull Ct
    Posts
    915
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    27

    Re: Co interior, alternate and corresponding angles.

    Hi jesseE fantasma,
    Google parallel lines and transversals for angle definitions and properties.If you can't find a proof for a theorem like alternate interior angles are equal repost and I will give you one.In geometry you learn theorems and learned you can use them without proof to solve a problem


    bjh
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