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Reza's Circle

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Author: Reza Kassai
Description: teacher support active problem Geometry, difficulty level 2. OC is the radius of a circle and has a length of sqrt2 units. DE is the perpendicular bisector of OC. BA is tangent to the circle at A. DC = CB. Find the length of AB.
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=3135
Support page: http://mathforum.org/pow/support/geopow/20040412geo.teacher.html
Solution page: Problem #3135

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