Right triangle trigonometry

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Across
  1. 5. when both the hypothesis and conclusion are negated
  2. 6. the quantitative relation between two amounts
  3. 8. an angle between the horizontal plane and oblique line from the observer's eye to some object above his eye
  4. 11. a2+b2=c2
Down
  1. 1. the ratio of the side of the angle opposite the angle divided by the hypotenuse
  2. 2. two angles that are side by side and share a common vertex and a common side
  3. 3. the longest side of a right triangle, opposite the right angle.
  4. 4. a triangle with a right angle.
  5. 7. the angle between the horizontal line and the observation of the object from the horizontal line
  6. 9. the ratio of the length of the adjacent side to that of the longest side
  7. 10. the angles directly opposite each other where two lines cross.
  8. 12. a line touching circles or an ellipse at only one point