Crossword homework

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Across
  1. 2. going through
  2. 5. the fundamental length of metric system
  3. 6. in addition
  4. 8. a quadrilateral with 4 angles and all sides of equal length
  5. 9. pleasantly
  6. 12. a natural way of acting or thinking
  7. 13. what a caterpillar uses to transform
  8. 16. what a spider uses to shoot webs
  9. 17. sending out light
  10. 18. proudly
  11. 20. unusual
Down
  1. 1. the square units around a shape
  2. 3. a wide quadrilateral 4 right angles and all sides of equal length
  3. 4. the action of measuring something
  4. 7. repeated addition
  5. 10. old and torn
  6. 11. surprising
  7. 14. respect and warm approval
  8. 15. a metric unit of a length, equal to hundredth of a meter
  9. 19. the answer of length times width