Posted by **Brianne** on Thursday, May 12, 2011 at 3:19pm.

Triangle ABC is circumscribed about circle O and D,E, and F are points of tangency. If AD= 5, EB= 5 and CF= 10, find the lengths of the sides of the triangle and show that the triangle is isosceles

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**Anonymous**, Tuesday, May 28, 2013 at 2:48pm
shown that B'=90 degrees

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