To calculate the circumference of a circle, we use the formula:
Circumference (C) = π * Diameter (d)
Given that the diameter (d) of the circle is 20 mm and we're using 3.14 as an approximation for π (pi), we can substitute these values into the formula.
C = π * d
C = 3.14 * 20 mm
C = 62.8 mm
Therefore, the circumference of the circle is 62.8 mm.
