- Enter functions f(x) and g(x) to form a region. (These must be a function of x)[br][br]- Set the lower and upper bounds of the region in their respective input boxes. (Please note that these are always x values.[br][br]- Set your axis of rotation in the input box. This can be the equation of any line.[br][br]- Use the slider 'p' to rotate your region about the x-axis and generate your solid.[br][br]- You can turn off either function and its accompanying surfaces/curves using the checkboxes.[br][br]-Use two fingers to zoom in/out on the solid.