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A three dimensional plot with axes labeled
\(x\text{,}\) \(y\text{,}\) and
\(z\text{.}\) The region of a cone along the positive z-axis between the radius 1 and 2 from the origin with positive y coordinate is shown in blue. The half sphere of radius 1 centered at the origin with positive y-coordinate and below the blue cone is shown in gray. The half sphere of radius 2 centered at the origin with positive y-coordinate and below the blue cone is shown in yellow. The portion of the annular region between the spheres and on the xz-plane with positive x coordinate is shown in green. The portion of the annular region between the spheres and on the xz-plane with negative x coordinate is shown in red.