TRIGOZZLES

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Across
  1. 1. a navigational instrument that shows four direction points.
  2. 4. father of trignometry
  3. 6. The movement of the star against the background as we orbit the Sun
  4. 7. from Greek trigōnon, "triangle" and metron, "measure")
  5. 8. sina/cosA
  6. 9. hypotenuse side/adjacentside
Down
  1. 1. is an instrument for measuring angles of slope
  2. 2. right-angle triangles each of which is a two-dimensional triangle with one angle equal to 90 degrees
  3. 3. another name for clinometer
  4. 5. longest side of a right traingle