Final answer:
The circumference of a circle with a diameter of 14cm is 14π cm, using the formula C = πd.
Step-by-step explanation:
To work out the circumference of a circle in terms of pi, we use the formula for circumference which is C = πd, where C is the circumference and d is the diameter of the circle. With a given diameter of 14cm, we can substitute this value into the formula to find the circumference:
C = π × 14cm
Therefore, the circumference of the circle is 14π cm. It is often left in terms of pi for exactness, and the units of the answer are centimeters because we are measuring length.