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A TST Problem That Makes You Think Is This Really a TST Problem

Source: Germany TST 2013 P4

April 14, 2020
geometry

Problem Statement

Two concentric circles ω,Ω\omega, \Omega with radii 8,138,13 are given. ABAB is a diameter of Ω\Omega and the tangent from BB to ω\omega touches ω\omega at DD. What is the length of ADAD.
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