Posted by **nbvhj** on Monday, August 6, 2007 at 11:18am.

Prove the following: if, in a triangle ABC,BA =CB

O in atriangle

mÐ BAO = mÐ OAC = 20°,

mÐ ACO = 10°,

and mÐ OCB = 30°,

then mÐ OBC = 80°.

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