math crossword puzzle

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Across
  1. 4. the number found by multiplying all of the number factor term together
  2. 9. expression in expanded form
  3. 10. written down in a way the is common
  4. 11. length that passes through a center of a circle
  5. 12. the length of any line segment
  6. 13. allows numbers in multiplication to be distributed
  7. 14. terms that have the same variable to the same power
  8. 16. the distance around a circle
  9. 18. indicating that two expressions are equal
  10. 19. any two angles with a common side
Down
  1. 1. indicating that two numerical expressions are equal
  2. 2. value of the ratio of a circles circumference
  3. 3. set of all points in the plane
  4. 5. compares two values
  5. 6. an equation that is true no matter the values
  6. 7. multiply together to get another number
  7. 8. part of a line or curve
  8. 15. a group of numbers and symbols
  9. 17. the amount of space enclosed in a three-dimensional object