We begin with the information given. The radius is 6cm.
What we need is the circumference. The formula for the circumference of a circle is C = πd
This the Circumference is equal to pi times the diameter.
The radius is half the diameter. If the radius is 6cm, the diameter is 12cm.
Now plus in this information to the formula.
C = πd
C = π(12) You may want to use a calculator. Though you should know π = 3.14
C = 37.38
The circumference is 37.68cm. Rounded to the nearest centimeter, the circumference is 38cm.