Hyperbolic plane geometry is also the geometry of saddle surfaces and pseudospherical surfaces, surfaces with a constant negative Gaussian curvature. A modern use of hyperbolic geometry is in the theory of special relativity, particularly Minkowski spacetime and gyrovector space.

1 ReviewWrite review
Musical Instruments: History, Technology, and Performance of Instruments of ...
By Professor of Musical Acoustics Murray Campbell, Murray Campbell, Clive A. Greated, Arnold Myers, Senior Lecturer in Music and Director Arnold Myers
Answer:
k-12
Explanation:
i love it and im a crybaby <3
