Any maths geniuses out there? I need a quick hint on a problem....

There are 4 circles, three of them inside the fourth, two of the inner ones 
are identical (sizes). All the circles are tangential to one another (they 
all touch - but dont intersect - each other) The two inner circles that are 
the same size have diametres equal to the radius of the larger one.

The question is, how would one go about calculating the radius of the 
smallest circle?

Cheers, and sorry for the non LU stuff (wheels within wheels not 
withstanding ;))

Damian



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oh alright then :-)

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