Fun with Maths

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Across
  1. 3. A value or limit that helps define a system
  2. 4. A number greater than 1 with only two factors, 1 and itself
  3. 9. A number that can be positive, negative, or zero
  4. 10. A number representing a part of a whole
Down
  1. 1. Two lines that never meet
  2. 2. Distance from the center to the edge of a circle
  3. 5. A mathematical statement showing equality
  4. 6. The space between two lines meeting at a point
  5. 7. A symbol representing an unknown value
  6. 8. The space inside a shape