Math

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Across
  1. 4. portion inside the closed line segments
  2. 6. the least
  3. 8. extends infinitely on both sides
  4. 9. a zero dimension
  5. 11. the outer boundary
  6. 12. a one dimension
  7. 13. line from the center to edge of circle
Down
  1. 1. at the most
  2. 2. the outer limits
  3. 3. the longest chord in a circle
  4. 5. a curved line
  5. 7. the only three sided polygon
  6. 10. sum of all the sides