Answer:
12π or 37.7 cm
Explanation:
The formula for the circumference of a circle is 2πr or πd. In this case, r represents the radius, a segment from the center of the circle to any point on the circle. The d stands for diameter, a line running through two endpoints on the circle with the center point in the middle. This means that the diameter is twice the radius (imagine a line cutting across half a pizza and then a line cutting across only a quarter, this is diameter and radius at work!).
To solve for the circumference, I will use both formulas (although πd is easier since the diameter is already given)
2πr
2π(12/2)
2π(6)
12π ≈ 37.7 cm
πd
π(12)
12π ≈ 37.7 cm