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        riddles >> medium >> a triangle
        
(Message started by: tony123 on Aug 6th, 2007, 6:27pm)
Title: a triangle
Post by tony123 on Aug 6th, 2007, 6:27pm
Prove the following: if, in a triangle ABC,  BA =CB
O in atriangle
< BAO = < OAC = 20°,
< ACO = 10°,
and < OCB = 30°,
then< OBC = 80°.
Title: Re: a triangle
Post by Barukh on Aug 8th, 2007, 9:08am
This (http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_medium;action=display;num=1069922798) is relevant.


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