Hello can someone please help me solving this question

Let S be a region that bounded by a semicircle of radius 1 and the r-axis where y > 0. (a) Draw the region S. Be sure to make your picture clear and label any important points. (b) Set up, and evaluate an integral for the area of the region S. (c) Find the centroid of the region S. Show all your work. Simplify any numerical answer, and leave your final answer in exact form (i.e. radicals or fractions)