Maria Laktiri Trig Puzzle

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Across
  1. 1. The height of a wave or the maximum value of a trig function
  2. 3. Relating to the theorem a² + b² = c²
  3. 4. Formula relating sides and angles in any triangle
  4. 8. Reciprocal of sine
  5. 9. Reciprocal of cosine
  6. 12. The figure formed by two rays with a common endpoint
  7. 13. The length of one full cycle of a trig function
  8. 15. Equation true for all values of the variable
  9. 16. One of the four sections of the coordinate plane
  10. 17. Ratio of the opposite side to the adjacent side
  11. 18. Circle with radius 1 used to define trig functions
Down
  1. 2. Unit for measuring angles, with 360 in a full rotation
  2. 5. The side across from a given angle in a triangle
  3. 6. Function that reverses another trig function
  4. 7. Reciprocal of tangent
  5. 10. The side next to a given angle, but not the hypotenuse
  6. 11. The longest side of a right triangle, opposite the right angle
  7. 14. Ratio of the opposite side to the hypotenuse in a right triangle
  8. 19. Ratio of the adjacent side to the hypotenuse
  9. 20. A unit of angle measure based on the radius of a circle