Geometry crossword

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Across
  1. 5. The length, width or height of something
  2. 8. Any closed shape with 4 sides
  3. 10. Famous quadrilateral
  4. 12. Angle exactly 90 degrees
  5. 17. Angle greater than 90 degrees
  6. 18. Angle less than 90 degrees
  7. 20. 100 times smaller than a meter
Down
  1. 1. object with a base
  2. 2. A dot
  3. 3. the British way of measuring
  4. 4. perimeter of a circle
  5. 6. A surface that extends infinitely
  6. 7. The thing that separates inside of a shape from the outside
  7. 9. squares inside an object
  8. 11. three sided shape
  9. 13. Baseline measurement for weight
  10. 14. Extends in both directions
  11. 15. How bent a line is
  12. 16. cubes inside an object
  13. 19. Learning about shapes