1. **Problem:** Sketch a cylinder with radius 3 and height 10, and shade one of its bases. 2. **Formula and explanation:** A cylinder is a 3D shape with two parallel circular bases and a height connecting them. 3. **Sketch details:** The radius of the base is 3 units, and the height is 10 units. 4. **Labeling:** The radius is labeled as 3 near the bottom circular base. 5. **Shading:** Shade the top circular base to indicate it is highlighted. 6. **Summary:** The cylinder has a circular base of radius 3, height 10, and the top base is shaded as requested.