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Math Help - Practical geometery/triangle making

  1. #1
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    Jan 2008
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    Thumbs down Practical geometery/triangle making

    !!!A GOOD TIME!!!
    My problem is concerned with practical geometery.If questiones are given like this
    CONSTRUCT TRIANGLES!

    (1):mAB:3.8cm mBC:4cm m<B:75 degree
    PROBLEM:Which one to take as base & why ??
    (2):m<A:30 mBC:2.5cm mAB:5cm
    PROBLEM:Which one to take as base & why??


    In short i want it described properly that,when measurements are given,how to judge which is base?

    THANK YOU FOR ASSISTING ME!
    Last edited by mr fantastic; January 25th 2009 at 02:06 AM. Reason: Deleted excessive use of smilies.
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  2. #2
    Member
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    Dec 2008
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    152
    base can be any of the sides of the triangle. It doesn't really matter which one you take. Base is usually the one that has a 90 angle with the known altitude that goes to the vertex that is opposite to the base side. If none of the altitudes are given then it doesn't matter which side you take as the base.

    When constructing triangles you usually take the side that has a known angle next to it as a base. In your first case the angle is between the sides so any of them can be taken as the base.. In your second case only mAB has a known angle (m<A) next to it so you take mAB as the base.

    At least that's what I think.
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