The image you've uploaded seems to be a set of engineering assignment problems involving centroids of different shapes. Let's go through each problem:

1. Hollow Circular Section: The first part asks you to determine the coordinates (x, y) of the centroid of a hollow circular section. The image shows a rectangular section with circular cutouts.

2. Trapezoidal Shape with Semi-Circular Cutout: The second part involves a trapezoidal shape with a semicircular area removed from it. You are asked to find the centroid of the remaining area after the cut.

To solve these problems, you'd typically use the principles of finding centroids of composite areas, which involves calculating the centroid of each individual shape (like the rectangle, circles, and semi-circle) and then using the area-weighted average method to find the overall centroid of the remaining area after subtraction.

Would you like me to walk through the steps of solving these problems in detail? If so, do you want a specific area of the solution to be explained?