math crossword puzzle

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Across
  1. 2. 3 dimensional shape with polygon as a base and lateral surfaces
  2. 5. 2 pairs of congruent adjacent sides
  3. 7. 3 dimensional shape with 2 bases connected by lateral sides
  4. 8. quadrilateral with 2 pairs of parallel sides
  5. 10. a comparison between 2 numbers
  6. 11. rotating a shape a certain degrees to a point
  7. 14. the rise of a line over the run of a line
  8. 15. average between 2 points
  9. 19. opposite reciprocals
Down
  1. 1. 3 dimensional shape with 2 bases and curved surface
  2. 3. two equal side length
  3. 4. have the same slope
  4. 6. an equation where 2 ratios are equal
  5. 9. curve joining 2 endpoints
  6. 11. triangle one right angle
  7. 12. 4 sided shape that is congruent
  8. 13. the large arc connecting endpoints
  9. 16. line that is in center of circle
  10. 17. three edges and the vertexes
  11. 18. the smaller arc connecting endpoints