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Problem 190.
Tangent circles, Tangent chord, Perpendicular, Distance |
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In the figure below, AB is the
diameter of circle of center O and radius r. OB is the diameter
of circle of center O'. The chord AD is tangent to circle O' at
E. If DF is perpendicular to AB and BF = x, prove that  .
Post
a
comment or solution.
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