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In the following diagram there are three...

In the following diagram there are three circles packed in another circle, such that each circle is tangent to all other circles in this arrangement. The radius of the circumscribing circle A is 1 cm, and circle B and circle C are congruent. Find the radius of the circle D.

A

A) 1/4 cm

B

B) 1/3 cm

C

C) 2/5 cm

D

D) 3/10 cm

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B
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