Adrian's Puzzle

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Across
  1. 5. The ratio of the hypotenuse to the side opposite an acute angle; the reciprocal of sine.
  2. 8. What is distinguished from other formulas for the area of a triangle.
  3. 10. A circle with a radius of one.
  4. 11. The ratio of the side (other than the hypotenuse) adjacent to a particular acute angle to the side opposite.
  5. 13. A unit of measurement of angles.
  6. 14. A unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius.
  7. 15. The ratio of the hypotenuse to the shorter side adjacent to an acute angle ; the reciprocal of a cosine.
  8. 18. What is a theorem relating the sides and angles of spherical triangles.
  9. 20. The maximum extent of a vibration or oscillation, measured from the position of equilibrium.
Down
  1. 1. The distance required for the function to complete one full cycle.
  2. 2. The longest side of a right triangle, opposite the right angle.
  3. 3. A mathematical expression or function so related to another that their product is one.
  4. 4. Next to; neighboring.
  5. 6. The angle of less than 360 degrees that corresponds to an angle of over 360 degrees.
  6. 7. The trigonometric function that is equal to the ratio of the side adjacent to an acute angle to the hypotenuse.
  7. 9. An equation relating the lengths of the sides of an arbitrary triangle to the sines of its angles.
  8. 12. A part of a line starting at a particular point and extending infinitely in one direction
  9. 16. Two rays sharing a common endpoint. Angles are typically measured in degrees or radians.
  10. 17. A straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.
  11. 19. The trigonometric function that is equal to the ratio of the side opposite a given angle to the hypotenuse.