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Khan Academy
Khan Academy: Calculus: Solid of Revolution (Part 1)
Video lesson introducing how to use definite integrals and the disk method to find the volume of a solid rotating about the x-axis. Reviews what a definite integral is. [10:05]
Khan Academy
Khan Academy: Calculus: Solid of Revolution (Part 3)
Video lesson using the disk method of integration to derive the formula for the volume of a sphere. [8:59]
Khan Academy
Khan Academy: Calculus: Solid of Revolution (Part 2)
Video lesson using the disk method of integration to find the volume of a specific solid of revolution. Begins to discuss using the method to find the volume of a sphere but doesn't finish the example. [7:31]