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Author: Annie Fetter
Description: Geometry, difficulty level 3. AOD is a diameter of circle O. B is any point on the circle. At B, a tangent is drawn to the circle. From the center, O, a line is drawn parallel to AB, meeting the tangent at P. Prove that PD is tangent to the circle.
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Problem page: /library/go.html?destination=1143
Solution page: Problem #1143

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