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The centres of three circles A, B and C ...

The centres of three circles A, B and C can collinear with the centre of circle B lying between the centres of circle A and C circles A and C both touch extemally to circle B and the thre circles share a common tangent line. Given that circle A has radius 12 nd circle B has radius 42 the radius of circle C, is equal to `"_____"`

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The correct Answer is:
`147.00`
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