Sketching disks ,washers and shells : sketch the three disks , washers , shells that result from revolving the rectangles shown in the figure around the given lines
y axis .
Since there is no gap between rectangles and y axis the resulting figure formed after revolving is disk .
WE have been given
To find out the figure formed after revolving about x- axis .
Since from the figure we can see that there is no gap between y- axis and rectangle the resulting solid formed after revolving around y-axis is disk.
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