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Math Help - I need help with these geometry please?

  1. #1
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    I need help with these geometry please?

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  2. #2
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    Re: I need help with these geometry please?

    What does the notation with two letters and the curved line on top mean?
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  3. #3
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    Re: I need help with these geometry please?

    Let O be the centre of the circle. The information \widehat{CD}=55^\circ tells you that \angle COD=55^\circ. Now use the theorem that the angle at the centre is twice the angle at the circumference to find \angle DBC. Can you see how to continue the problem from there?
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    Re: I need help with these geometry please?

    Hi zokura,
    This is what you need to know

    angle between secants = 1/2( far arc - near arc)
    angle between chords =1/2 the sum of arcs created by each equal vertical angle
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