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conjugate axis

The perpendicular axis of a hyperbola that sets the height of its sketching box, without touching the curve.

The conjugate axis of a hyperbola is the segment through the center, perpendicular to the transverse axis, connecting the co-vertices (0,\pm b), with length 2b. It never touches the hyperbola itself — its only job is sizing the central box whose diagonals become the asymptotes.

See also

transverse axis
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