Geometry

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Across
  1. 1. exactly vertical or upright
  2. 4. next to each other
  3. 7. (angle/360)x2
  4. 8. 2 sides are equal
  5. 10. a^2+b^2<c^2
  6. 11. a^2+b^2=c^2
  7. 12. adds up 10 180 degrees
  8. 14. a^2+b^2>c^2
  9. 15. the angles that lie opposite to each other when two lines intersect
  10. 16. all sides are equal
Down
  1. 2. adds up to 90 degrees
  2. 3. no sides are equal
  3. 5. a^2+b^2=c^2
  4. 6. rise/run
  5. 9. 2xpixr
  6. 13. extending in the same direction, equidistant at all points, and never converging or diverging