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Horizontal segment, with 2 concentric semicircles with the diameters on the right 2 thirds of the segment, region between semicircles is shaded, radius of smaller semicircle is 3, radius of larger semicircle is 4.A horizontal flag is shown at right. The radius of the outer semicircle is . The radius of the inner semicircle is .

  1. Imagine rotating the flag about its pole and describe the resulting three-dimensional figure. Sketch this figure on your paper.

    Imagine a hollow rubber ball. The rubber is -inch thick and the radius is inches.

  2. Calculate the volume of the rotated flag.