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Homework Help: Simple Geometry Problem

  1. Jan 5, 2010 #1
    The problem statement, all variables and given/known data


    Find the blue angle. My apologies that the picture is not drawn to scale (some angles are misrepresented by the picture).

    In case you have difficulties reading the picture, the angles are from the top, clockwise:

    20, 10, 70, 60, 20

    The attempt at a solution


    These are all the angles labeled that can be easily proved. That's as far as my knowledge goes.
  2. jcsd
  3. Jan 5, 2010 #2


    User Avatar
    Homework Helper

    Have you learnt the sine and cosine laws? Try to apply. It also might help that you have an other isosceles triangle, with 20o angles.

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