GEOMETRY

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Across
  1. 3. a line passing through two nonadjacent edges of a polyhedron
  2. 6. a solid formed by plane faces
  3. 8. the total length of the lines that form a shape
  4. 10. a nine sided polygon
  5. 11. The difference between the direction of two lines that come together
  6. 13. a kind of triangle that have sides of unequal length
  7. 16. a four sided polygon
  8. 17. The size of a given surface
  9. 18. a location determinable by an exact set of coordinates
  10. 19. An angle that is greater than 90 but less than 180 degrees
Down
  1. 1. a 10000 sided polygon
  2. 2. a line with a start point but no end point
  3. 4. connected set of infinitely many points
  4. 5. the point where two lines meet to form an angle
  5. 6. a kind of line that intersects at a right angle with each other
  6. 7. An angle that is exactly 90 degrees
  7. 9. a kind of angle which is greater than 180 degrees
  8. 12. The founder of modern geometry
  9. 14. a 10 sided polygon
  10. 15. a polygon with five sides