The distance from the center to the edge of a circle is called its **radius* (*r*), and this is related to the circumference (*c*) by the formula `c = 2πr`. We have

`3 = 2πr`

and we would like to solve for `r`. Basic algebra gives us

`3/(2π) = r => r = 3/(2π) => r = 1.5/π = r ~= 0.477`

So the distance is **1.5/π cm, or ~0.477 cm**.
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