Trigonometry Crossword Puzzle

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Across
  1. 2. having a common boundary or edge
  2. 3. ratio of the adjacent side to the hypotenuse of a right-angled triangle
  3. 5. the inverse function of the tangent
  4. 9. ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
  5. 11. the unit of plane angle adopted under the Systeme International d'Unites
  6. 12. a function obtained by expressing the dependent variable of one function as the independent variable of another
  7. 14. the space between two lines or planes that intersect
  8. 15. a straight line that intersects a curve at two or more points
  9. 16. ratio of the hypotenuse to the opposite side of a right-angled triangle
Down
  1. 1. a relationship or expression involving one or more variables
  2. 4. function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle
  3. 6. the inverse function of the cosine
  4. 7. ratio of the adjacent to the opposite side of a right-angled triangle
  5. 8. the inverse function of the sine
  6. 10. of or relating to or according to the principles of trigonometry
  7. 13. equal to the ratio of the sides (other than the hypotenuse) opposite and adjacent to an angle in a right triangle.