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Mathematics 7 Online
OpenStudy (anonymous):

In the diagram below, and are tangent to O. What is the measure of DEF? http://assets.openstudy.com/updates/attachments/53d109f4e4b0f2f7e5e821de-lilcrunch-1406208508511-d18c2fe2b4634f0e934e53a49aff680a.gif

OpenStudy (anonymous):

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