Complicated Maths

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Across
  1. 4. The ratio of the length of the adjacent side to that of the hypotenuse
  2. 7. pointing in only one direction
  3. 9. a line that passes through two lines in the same plane at two distinct points
  4. 10. each angular point of a polygon, polyhedron or other figures
  5. 13. a path between two nodes that has the fewest edges if the cost of travelling along each edge is the same
  6. 14. a connected graph using all vertices in which there are no circuits
Down
  1. 1. next to a given angle
  2. 2. the one across from a given angle
  3. 3. The ratio of the side of the angle opposite the angle divided by the hypotenuse
  4. 5. a way in which to measure angles
  5. 6. a trail in which never vertices nor edges are repeated
  6. 8. the line that join other surfaces
  7. 11. a line touching circles or an ellipses at only one point
  8. 12. the longest side of a right-angles triangle compared to the length of the base and perpendicular