| 21. | That's when he chose figuring trigonometry functions instead of suicide.
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| 22. | We never had algebra and geometry, let alone trigonometry.
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| 23. | Trigonometry and Solid Geometry, or Trigonometry and Analytical Geometry.
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| 24. | Trigonometry and Solid Geometry, or Trigonometry and Analytical Geometry.
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| 25. | In spherical trigonometry, angles are defined between great circles.
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| 26. | Thus spherical trigonometry differs from ordinary trigonometry in many respects.
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| 27. | Thus spherical trigonometry differs from ordinary trigonometry in many respects.
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| 28. | Trigonometry tells you roughly where the mobile transmitter is located.
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| 29. | He also discovered spherical trigonometry, along with other interesting trigonometrical results.
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| 30. | Other works included papers on astrology, trigonometry and music.
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