http://img33.imageshack.us/img33/335...ialangles6.jpg

Please explain. Thanks

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- Aug 17th 2011, 05:02 PMzokuraI need help with these geometry please?
http://img33.imageshack.us/img33/335...ialangles6.jpg

Please explain. Thanks - Aug 17th 2011, 05:18 PMProve ItRe: I need help with these geometry please?
What does the notation with two letters and the curved line on top mean?

- Aug 17th 2011, 11:48 PMOpalgRe: 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?

- Aug 22nd 2011, 09:37 AMbjhopperRe: 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