To calculate the volume of a solid using the disk method, you need to follow these steps:
1. Determine the axis of rotation: This is the line around which the region is being rotated to form the solid.
2. Identify the region: Determine the boundaries of the region in terms of the variable being integrated.
3. Integrate: Use the formula V = ∫(πr^2)dx, where r is the distance from the axis of rotation to the curve and x is the variable being integrated.