Geometry Crossword Puzzle

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Across
  1. 5. prism or cylinder whose sides are not perpendicular to the bases
  2. 6. line that cuts through 2 or more parallel lines
  3. 7. point of concurrency of angle bisectors
  4. 8. point of concurrency of the altitudes
  5. 11. 3 or more lines that intersect at the same place
  6. 12. sum of the lengths of a polygon's sides
  7. 13. angles that add up to 90 degrees
  8. 14. a set of points equidistant from a given point
  9. 16. point of concurrency of perpendicular bisectors
  10. 18. non-rigid transformation that preserves shape, but not necessarily size
  11. 19. adjacent supplementary angles
  12. 20. represents an angle measure
Down
  1. 1. angles that add up to 180 degrees
  2. 2. rigid transformation that is expressed by the rule (x,y) -> (x h, y k)
  3. 3. angles that are in the same position
  4. 4. same shape but not necessarily the same size
  5. 9. lines that remain the same distance apart and never intersect
  6. 10. two lines that meet at right angles
  7. 15. same shape AND size
  8. 17. point of concurrency of the medians