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Thread: 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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    Re: I need help with these geometry please?

    Let $\displaystyle O$ be the centre of the circle. The information $\displaystyle \widehat{CD}=55^\circ$ tells you that $\displaystyle \angle COD=55^\circ.$ Now use the theorem that the angle at the centre is twice the angle at the circumference to find $\displaystyle \angle DBC.$ 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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