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Past exam of the mathematics course of the University of Cambridge / 2023 / ib / Paper 3 / 12E / ii / Solution

The plane
(78)
meets the one-sheet hyperboloid in the two disjoint curves
(79)
They are the two opposite meridians of the surface of revolution. Parametrize the generating profile by arc length. Its acceleration lies in the meridian plane and is orthogonal to the profile tangent; it is also orthogonal to the azimuthal tangent. It is therefore normal to the surface, so both meridians are geodesics. This is the disjoint case in plane-section geodesics of the unit one-sheet hyperboloid.
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