STEP 1: find radius $ r $
To find radius $ r $ use formula:
$$ C = 2 \cdot r \cdot \pi $$After substituting $ C = 3 $ we have:
$$ 3 = 2 \cdot r \cdot \pi $$ $$ r = \dfrac{ 3 }{ 2 \pi } $$ $$ r \approx 0.4775 $$STEP 2: find diameter $ d $
To find diameter $ d $ use formula:
$$ d = 2 \cdot r $$After substituting $ r = 0.4775 $ we have:
$$ d = 2 \cdot 0.4775 $$ $$ d \approx 0.9549 $$