Math

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Across
  1. 2. circle of unit radius
  2. 4. Concept of navigation
  3. 6. All sides equal
  4. 8. No equal sides
  5. 9. Variable used to represent an unknown angle
  6. 10. X
  7. 11. The average between the maximum and minimum values
  8. 14. A portion of the edge of a circle
  9. 15. 0,90,180,270,360
  10. 16. 2 sides equal
  11. 17. Y
  12. 18. Angle between the horizontal line and the line of sight from the observer to an object at a higher level
Down
  1. 1. Up or down
  2. 3. A triangle that is not a right triangle
  3. 5. The quarter increments of the period
  4. 7. Angle between the horizontal line and the line of sight from the observer to an object at a lower level
  5. 9. Y/X
  6. 10. Angle with vertex at the center of the circle and sides are radii
  7. 12. The horizontal length of a cycle
  8. 13. Left or right