Washer method is an extension of the Disk method for finding the volumes of more elaborate solids of revolution.
6521_Generalizing_the_washer_method.html
6520_Disk_method_for_rotation_around_x_axis.html
6524_Washer_or_ring_method_for_vertical_line_rotation.html
6522_Washer_method_rotating_around_non_axis.html
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