Where's the Proof?

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