The perimeter of a figure is the sum of the lengths of all its sides. In the case of a semicircle, the perimeter is the sum of the curved part (half the circumference of the circle) and the straight part (the diameter of the circle).

The formula for the circumference of a circle is C = 2πr, where r is the radius. Since we have a semicircle, we only need half of the circumference, so the curved part is C/2 = πr.

The straight part is the diameter of the circle, which is twice the radius, so it is 2r.

In this case, the radius is 6 cm, so the curved part is π(6) = 6π cm, and the straight part is 2(6) = 12 cm.

Therefore, the perimeter of the figure is 6π + 12 cm.

To find the perimeter to one decimal place, we need to approximate the value of π. Using 3.14 as an approximation for π, the perimeter is approximately 6(3.14) + 12 = 18.84 + 12 = 30.84 cm.

Therefore, the perimeter of the figure to one decimal place is 30.8 cm.