Evelyn's Crossword :):

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Across
  1. 2. Goes from one side of the circle to the other
  2. 5. An angle that has a vertex at the center of a circle
  3. 8. bigger than zero
  4. 10. A number that can be written as a fraction of two integers
  5. 11. A line from the center of the circle to the outside
  6. 14. Less than zero
  7. 15. Adds up to 180
  8. 16. Across from each other
Down
  1. 1. Next to each other
  2. 3. When the variables match exactly
  3. 4. the answer to a multiplication problem
  4. 6. The distance from zero
  5. 7. Adds up to 90
  6. 9. The perimeter of a circle
  7. 12. Positive and negative whole numbers
  8. 13. The opposite operation