Answer:
approximately 18.85 cm.
Explanation:
So let's start with the basic understanding of circumference. Circumference is the perimeter of a circle. It's formula is:
C=2 x pi x r or C= pi x d
So in your case the diameter is 6
2) Plug it into the formula:
C = pi x 6
The exact answer would be 6pi, but with rounding it would be approximately 18.85 cm. :D