regular polygons

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Across
  1. 4. one straight edge of a polygon
  2. 6. dividing into equal parts
  3. 8. a math rule used to solve a problem
  4. 9. the distance from the center to the middle of a side
  5. 11. a shape with three sides
  6. 12. to find an answer using math
  7. 14. a harder problem that makes you think
  8. 16. a polygon with five sides
  9. 17. having all sides and angles equal
  10. 18. how long a side is
  11. 19. a polygon with eight sides
Down
  1. 1. flat shapes used to cover a floor
  2. 2. the total distance around a shape
  3. 3. the space inside a shape
  4. 5. a closed shape with straight sides
  5. 7. a quick drawing of a shape
  6. 10. a polygon with six sides
  7. 12. the point equally distant from all sides
  8. 13. to tell how you found your answer
  9. 15. to write names or values on a diagram