9A 9B SOH CAH TOA: The magic spells of math

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Across
  1. 2. How to undo division?
  2. 5. The inverse operation of addition.
  3. 6. The Greek letter that is always unknown at the party
  4. 13. How to undo multiplication?
  5. 15. The unknown angle can be found using what-?
  6. 16. The longest side of a right angled triangle
  7. 18. Used for "Figures that have proportional sides"
  8. 19. The side across from the given angle
Down
  1. 1. A term for something that cuts an object into two equal parts.
  2. 3. Ratio of the opposite side to the adjacent side.
  3. 4. A triangle that is less than 90 degrees
  4. 7. The leg next to the angle that isn't the hypotenuse.
  5. 8. Last step to solve for the angle.
  6. 9. Ratio of the adjacent side to the hypotenuse
  7. 10. Cross ___ to solve for the unknown side length
  8. 11. A triangle with a 90 degree angle
  9. 12. Opposite, adjacent, and hypotenuse
  10. 14. Is the point where two sides of an angle meet
  11. 17. Ratio of the opposite side to the hypotenuse