What is the perimeter of a semicircle with a diameter of 14 cm?

The straight side is the diameter ($d$) of the semicircle, which is $14 \text{ cm}$.

The curved part is half the circumference of a circle. The formula for the circumference of a circle is $C = \pi d$.
Length of curved part $= \frac{1}{2} \pi d = \frac{1}{2} \times \frac{22}{7} \times 14 \text{ cm}$.
Length of curved part $= 11 \times 2 cm = 22 \text