Math terms

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Across
  1. 3. line length from circle center to edge
  2. 7. value that appears most often in a set
  3. 8. the central value of numbers in a set
  4. 9. a letter that represents unknown value
  5. 10. has an equals sign
  6. 11. number that expresses the central value
  7. 12. numbers, symbols operators grouped
Down
  1. 1. endpoint of triangle's 2 rays
  2. 2. boundary of a closed curved figure
  3. 4. expression of 2-dimensional figure
  4. 5. figure formed by 2 rays with endpoint
  5. 6. polygon with 3 edges, 3 vertices