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Across
  1. 2. - Introduced the concepts of tangent and cotangent.
  2. 8. Trigonometry on flat surfaces using angles and triangles.
  3. 10. - Introduced the use of Arabic algebraic and trigonometric methods, reproducing the tables in printed form.
  4. 11. general proposition not self-evident but proved by a chain of reasoning a truth established by means of accepted truths.
  5. 12. - the side opposite of the reference angle
  6. 15. One of the translated works of Regiomontanus
  7. 17. (Georg Joachim Iserin) - was a German astronomer and mathematician and the first to arcs of circles and prepared the best trigonometric tables using his time.
  8. 19. Trigonometry on curved surfaces like spheres (used in astronomy and navigation).
  9. 21. - founder of Trigonometry
  10. 22. the longest side of the triangle, opposite of the right angle
  11. 23. - deals with the properties and applications of ratios associated with angles.
  12. 24. introduced the abbreviations sin, cos, tan.
Down
  1. 1. (Analytical)- is a treatise on trigonometric theorems with special reference to infinite series.
  2. 2. the side adjacent to or beside the reference angle
  3. 3. Ancient Greek astronomer who used early trigonometry for mapping stars
  4. 4. Germany to the use of algebraic and trigonometric methods
  5. 5. - study of heavenly bodies
  6. 6. The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.
  7. 7. used Arabic numerals to prepare a table of sines
  8. 9. - Most prolific writer of mathematical subjects of all time.
  9. 13. wrote the first textbook that bared the title "Trigonometry"
  10. 14. The origin of trigonometry as a branch of mathematics traces back to the ancient Greeks.
  11. 16. Ages - A period Europe experienced after the fall of the Roman Empire.
  12. 18. - wrote the miscellanea analytical
  13. 20. - a greek word that means “triangle”