Three circles a,b,c touch each other externally and the circle 'd' internally , such that 'a' passes through the center of 'd' . The radius of circle 'a' is 1units . Circles 'b' & 'c' are congruent .Find the radius of 'b' or 'c'.

dear student,

This is just a simple problem of geometry .

First of all construct the circles according to the given conditions and then try to sove using geometric properties.

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