Exercises 21.10, page 611

  1. 1. (3 ,  − 5π3) ,  (3 , 4π3)

  2. 3. (5.83, 2.11)

  3. 5.

    A closed circle is plotted in quadrant 1 of a plane.
  4. 7.

    A closed circle is plotted in quadrant 4 of a plane.
  5. 9.

    A closed circle is plotted in quadrant 1 of a plane.
  6. 11.

    A closed circle is plotted in quadrant 4 of a plane.
  7. 13.

    A closed circle is plotted in quadrant 2 of a plane.
  8. 15.

    A closed circle is plotted in quadrant 3 of a plane.
  9. 17. (2 ,  π6)

  10. 19. (1 ,  7π6)

  11. 21.

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