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A three-dimensional plot with axes labeled
\(x\text{,}\) \(y\text{,}\) and
\(z\text{.}\) A surface similar to the outside of a bagel is shown. The center of the hole in the surface is at the origin and its inner opening is oriented along the
\(z\)-axis. Circular slices oriented radially from the
\(z\)-axis are highlighted in green and circular slices centered around the
\(z\)-axis are highlighted in red.