Math crossword puzzle

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Across
  1. 2. reflection- a imaginary line that makes a shape reflect itself
  2. 5. the m value in y=mx+b
  3. 7. 2 lines that keep going but never touch
  4. 8. exactly vertical or upright
  5. 10. a plain figure with 3 straight lines
  6. 11. when a object is turned clockwise or counterclockwise
  7. 12. a plain figure with 4 straight lines
  8. 13. The y axis runs in this direction
  9. 15. a transformation that changes the size of the figure
  10. 16. having 2 sides of an equal length
  11. 19. angles- angles that are formed inside the parallel lines by the intersecting straight line
  12. 20. divided into two parts
Down
  1. 1. a pattern of geometric shapes that fit together perfectly
  2. 3. having sides that are all different lengths
  3. 4. The x axis runs in this direction
  4. 6. a closed and flat shape made of lines
  5. 9. all sides are the same length
  6. 14. moves a shape left right or up and down
  7. 17. being exactly the same
  8. 18. a point in the middle