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Homework Statement
http://i41.tinypic.com/35mno6v.jpg
2. The attempt at a solution
So far, I found out that angle 4 and 5 is 55, because angle D is 110.. but I don't know if that's right. Please help!
It is significant because an angle formed by a chord and a tangent to a circle is half the arc it intercepts. Angles 2 and 4 are inscribed angles that intercept the same arc, so they are congruent.One thing I haven't used is the statement that AB is tangent at B. I don't understand why this is significant or how it ties into this problem.