Volume of Solid of Revolution about x-axis

For your reference: Enter in the function in the blue input box below. Adjust the "a" and "b" values by using either the sliders or entering them in the input boxes yourself. To the right is displayed what the solid of revolution would look like if you rotated the displayed area about the x-axis. As an exercise, try to calculate this volume and see how your answer compares to the volume displayed. (Note: For volumes that are irrational, the displayed value only approximates the true exact value.)