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Figures 3.3.12(a, b) each contains a graph of the surface defined by the given equation,
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whose standard form is
obtained by completing the square in and z. The standard form is the equation of a single-sheeted hyperboloid with center .
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The level curves, drawn on the surface of the cone, are the ellipses
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The cross sections and are hyperbolas, shown in Figures 3.3.12(a, b) where the sliders control the values of . Indeed, if , then the equation
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defines hyperbolas in the -plane, seen in Figure 3.3.12(a). Likewise, the cross sections are the hyperbolas
defined in the -plane, and shown in Figure 3.3.12(b).
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Figure 3.3.12(a) Single-sheeted hyperboloid with cross sections
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Figure 3.3.12(b) Single-sheeted hyperboloid with cross sections
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