Hyperbolic Geometry Test Review :D

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Across
  1. 3. There are 4 main ______ used to visualize hyperbolic geometry.
  2. 4. Corals use hyperbolic geometry to maximize this.
  3. 7. Hyperbolic geometry is a __________ geometry.
  4. 8. All triangle angles add up to ____ than 180 degrees.
  5. 9. Hyperbolic plane geometry has a constant _______ curvature.
Down
  1. 1. If two triangles are similar, they are also ______
  2. 2. So far, data has shown that the universe has a ____ curvature.
  3. 4. Hyperbolic geometry helps coral to maximize (6 across) while minimizing _____.
  4. 5. Hyperbolic planes have this many amount of parallels.
  5. 6. The negation of which axiom led to the "discovery" of hyperbolic geometry?