The radius is the distance between the centre of a circular arc and a point on the arc.
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If, by geometric number (?) you mean geometric mean, then the answer is 40.
gemo
The geometric mean of 12 and 16 is 13.8564064606
The geometric mean of 10 and 12 is: 10.9544511501
The geometric mean of 338 and 8 is: 52.0