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Math Help - Help me find the angle from this semi-circle

  1. #1
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    Joined
    Jul 2010
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    4

    Question Help me find the angle from this semi-circle

    Please help me find angle # 3 on this semi-circle




    As a separate question I would also like to know angle # 4



    If you could also please enplane your process. Thank you very much!
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  2. #2
    Newbie
    Joined
    Feb 2010
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    24
    y + 2y + 3y - 20 + 4y - 40 = 180

    then you calculate y, find angle 3 and 4

    These are very easy questions, you must study hard , i think
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