'In the adjoining figure, if the radius of each of the four outer circles is `r`, wha

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"In the
adjoining figure, if the radius of each of the four outer circles is `r`
, what is
the radius of the inner circle? (FIGURE)
(a) `2/(sqrt(2)+1)r`
(b) `1/(sqrt(2))r`
(c) `(sqrt(2)-1)r`
(d) `sqrt(2)\ r`"
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