please explain each step clearly (working and explanation) thank you!!

3. Gold Coats A. Right Circular Cylinder Let b > 0 be a constant real number. Create a right cylinder by revolving the line y=b about the x-axis. Paint this cylinder with a coat of gold paint and slice it into pieces each having width h. h Use calculus from chapter 8 to find the surface area of the slice whose left endpoint is some value x = a. This result should show you (perhaps unsurprisingly), that each slice has the same surface area.B Sphere Let R > 0 be a constant real number. Create a sphere by revolving the curve ) = VR - x2 about the x-axis. Paint this sphere with a coat of gold paint and slice it into pieces of width h. Maybe you've used an ::egg slicer::? h Our question: Which slice has the most gold surface area? Use calculus from chapter 8 to find the surface area of the slice whose left endpoint is some value x = a. What does your (perhaps surprising) result show you