L.49 and 50

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Across
  1. 3. quarter circumference of circle
  2. 4. contract of carrying out a previous contract/part of it
  3. 9. a person who supports system organized by government
  4. 11. solid object with 6 square sides; all equal
  5. 13. condition of having no limits; endless; unending quality
  6. 14. was social or friendly; to act friendly with others
  7. 15. the middle number of a series
  8. 16. avoiding or lacking a desire to be in company of others
  9. 17. the ability to push against a surface without skidding
Down
  1. 1. Line a line divided into equal segments by integers
  2. 2. to draw together; make shorter
  3. 5. a number or symbol put with or multiplying the other
  4. 6. opposed to interaction with other people
  5. 7. a person who lacks any sense of social responsibility
  6. 8. all the people; human beings living together as a group
  7. 10. liking company; friendly
  8. 12. to draw away from the mind, attention, etc; confuse
  9. 14. study of human behavior, human society and community life
  10. 15. basic unit of length in the metric system
  11. 18. any positive or negative whole number, or zero