Answer: To work out the area of a semicircle, we need to use the formula:
Area of a semicircle = (π * r^2) / 2
Given that π is approximately 3.142, we can substitute this value into the formula. However, you haven't provided the radius (r) of the semicircle, so I am unable to provide an exact answer. If you provide the radius, I can calculate the area for you.