Where's the Proof?

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Across
  1. 5. O/H
  2. 7. oppisite of cos
  3. 11. Is a technique to that shows how long the sides of a right angled triangle are.
  4. 14. An angle between 91 degrees and 159 degrees
  5. 15. the line next to the known or unknown angle
  6. 16. A triangle with all the same sides
  7. 18. oppisite of sine
  8. 19. O/A
Down
  1. 1. An angle less than 90 degrees
  2. 2. A triangle with a right angel in it
  3. 3. the longest side in a triangle
  4. 4. An angle over 180 degrees
  5. 6. A triangle with 2 sides that are the same length
  6. 8. An angle of 90 degrees
  7. 9. A/H
  8. 10. Pythagoras theorem
  9. 11. Process of showing a theorem
  10. 12. the line oppisite of the known or unknown angle
  11. 13. An angle of 180 degrees
  12. 17. oppisite of tan