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http://img8.imageshack.us/img8/3118/circlem.jpg [Broken]

As you see the diameter = 5cm and AD = 4cm

the required is to find AB

it seems quite easy ,its just 6cm. I can solve it but when supposing that AB is a tangent (and this is not given in the problem) also i can't make use of the right angle opposite to the radius of this circle , so there must be something wrong with my answer.

so ,can u help?

Thanks in advance

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# Homework Help: A Similarity problem

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