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Math Help - circle geometry urgent

  1. #1
    Newbie
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    Mar 2007
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    Exclamation circle geometry urgent

    the question states

    A,B and C are points on a circle with centre O. AO is parallel to BC. AC and BO intersect at D. angle BDC = 105 degrees. find the size of angle BCA.

    i have drawn the picture im jus finding it difficult as to where to start :S
    your help will be much appreciated cause i have spent numerous hours on this question

    thanks heaps
    xx
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  2. #2
    Super Member
    Joined
    Jan 2008
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    Thanks
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    Here are some hints for you.

    You will need to use:

    Opposite angles are equal
    Alternate angles of parallel lines are equal
    Angle at centre is twice the angle at the circumference
    Angle sum of triangle.

    If you don't know an angle, you can make that angle = x (a variable)

    Does it help?
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  3. #3
    Newbie
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    Mar 2007
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    hey thanks i will try that
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