The midpoint of the line segment joining the foci is called the centre of the hyperbola. In the given diagram and are the foci of the hyperbola, is the centre of the hyperbola.

The line through the foci of the hyperbola is called the focal length axis or transverse axis. In the given diagram X-axis is the focal axis of the hyperbola.

The line through the centre and perpendicular to the focal axis is called the conjugate axis of hyperbola, in the given diagram Y-axis is the conjugate axis of hyperbola.

The points where the hyperbola meets its focal axis are called its vertices and are the vertices of the hyperbola. The two separate parts of a hyperbola are called its branches.

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