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The diagram below shows three circles. Radius of circle A is 2 cm and radius of circle B is 1 cm. PQ is a tangent and all circles are in contact with one another. Find the radius of the smallest cir
The diagram below shows three circles. Radius of circle A is 2 cm and radius of circle B is 1 cm.
PQ is a tangent and all circles are in contact with one another. Find the radius of the smallest circle.