A semicircle is another way of saying half a circle, if we know the area of a circle is A= π * r^2 then all we have to do is take this equation and divide it by two to get the area of a semicircle. Additionally since we are given the diameter we need to divide that by 2 to get the radius which is six.
Now we can plug all the components into the equation: A= (1/2)(π)(6^2)
