#### Answer

3

#### Work Step by Step

First, we find the altitude:
$h = \sqrt{10^2 - 6^2} = \sqrt{64} = 8 $
We know that the point where the radius is represents 1/3 of the height. Thus:
$ r = 8 \times (1/3) = 2.67 \approx 3$

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3

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