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The region is about .
is the line segment on axis, so the equation of line is .
Use washer method to find the volume.
Method of washer:
The volume of the solid is , where is the cross sectional area of the solid .
Here the region is rotated about the line .
Outer radius is the distance between and .
Outer radius .
Inner radius is distance between the curve and the line .
Inner radius .
Integral limits are and .
Volume of the region by rotatating about is,
.
Volume of the region is .
Volume of the region is .
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