11. Bhaskara II developed spherical trigonometry , and discovered many trigonometric results. 12. It consists of five books on plane and spherical trigonometry . 13. I had studied plane and spherical trigonometry , conic sections, and Fergusson's " Astronomy ". 14. In the 13th century, Nasir al-Din Tusi ( Nasireddin ) made advances in spherical trigonometry . 15. In spherical trigonometry , angles are defined between great circles. 16. This simplified the spherical trigonometry by resolving the polar measurements directly into their Cartesian components. 17. Linear algebra, analytic geometry, plane and spherical trigonometry , and statistics in research were taken during sophomore. 18. He was also a pioneer in spherical trigonometry . 19. Guo worked on spherical trigonometry , using a system of approximation to find arc lengths and angles. 20. If the curvature of the Earth must be allowed for, then spherical trigonometry must be used.
