Geometry crossword

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Across
  1. 4. two dimensional shape with four congruent sides
  2. 6. middle of any line
  3. 11. radius x2
  4. 12. up and down
  5. 14. straight line
  6. 15. location given by x and y coordinate
  7. 16. surface amount
  8. 17. lines that never intersect
  9. 18. half of diameter
  10. 20. six sided shape
Down
  1. 1. any 4 sided shape
  2. 2. left and right
  3. 3. 3 dimensional shape with a circle as the base
  4. 5. third power
  5. 7. shape with 3 sides
  6. 8. add up all side of a shape
  7. 9. 4 sided shape with 2 pairs of parallel sides
  8. 10. C=2pieR
  9. 13. two lines meet and form a angle
  10. 19. second power