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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!

- Thread starter Turquoise
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http://i41.tinypic.com/35mno6v.jpg

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!

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Mark44

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What about angle 2 and 3? My answer was 55 for both of them..

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Mark44

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Hmm, I suppose I can't. Now I've hit the bricks, I don't know how to figure it out.

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Mark44

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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.

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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.

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