Arthur's geometry crossword

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Across
  1. 1. no hard angles
  2. 3. length of border
  3. 4. line segment that has only one endpoint
  4. 5. line intersecting two or more given lines in a plane at different points
  5. 9. 4 sides/90 degree
  6. 12. line having two end points
  7. 18. sum of two angles is 90
  8. 20. 4 sides 90 degree corners not all same size
Down
  1. 2. triangle with a 90 degree angle
  2. 6. area taken up
  3. 7. lines that line up perfectly
  4. 8. crossing lines
  5. 10. larger than 90 degrees
  6. 11. triangle where none of its sides are equal
  7. 13. smaller than 90 degrees
  8. 14. halve of a sphere
  9. 15. length of a circle
  10. 16. 3 strait sides
  11. 17. 8 sides=180
  12. 19. sum of two angles is 180