To find : the volume.
Answer to Problem 72E
The volume is
Explanation of Solution
Given information : The disk
Calculation :
The volume of torus is the same as the volume of a cylinder, the cylinder has just been rolled into a doughnut shape.
Therefore, the volume is given by the area of the cross section time the height.
The area of the cross section is
The height is
So, the volume of torus is
Chapter 8 Solutions
Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy)
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