Question: The method of finding the volume using the cylindrical shells is suitable when the axis of revolution is vertical. To find the volume of the

The method of finding the volume using the cylindrical shells is suitable when the axis of revolution is vertical.
To find the volume of the cylindrical shell, once can cut and "flatten" the shell to get a "rectangular box" shown on the figure above.
Today's problem.
Define R as the region bounded above by the graph of f(x)=x2 and below by the x-axis over the interval [1,2]. Find the volume of the solid of revolution formed by revolving R around the y-axis.
The method of finding the volume using the

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