Mathematics Crossword Puzzle

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Across
  1. 3. a six-sided polygon.
  2. 4. a mathematical statement that the values of two mathematical expressions are equal.
  3. 8. the quality of being made up of exactly similar parts facing each other or around an axis.
  4. 9. non prime numbers.
  5. 10. any of a set of straight lines passing through one point.
  6. 11. the continuous line (or the measurement of it) forming the boundary of a closed geometrical figure.
Down
  1. 1. a quadrilateral all of whose sides have the same length.
  2. 2. the mathematical average of a set of two or more numbers.
  3. 5. an angle less than 90 degrees.
  4. 6. a four-sided plane rectilinear figure with opposite sides parallel.
  5. 7. either of two angles whose sum is 180°.