math vocabulary

12345678
Across
  1. 2. the distance across a circle
  2. 4. the unit used to measure the size of an angle
  3. 7. expression of the sum or the difference of two
  4. 8. the set of whole numbers and their opposites
Down
  1. 1. the measure of the number of cubic units needed to fill space
  2. 3. the measure of the amount of surface on a flat surface
  3. 5. a mathematical statement that two quantities are equal
  4. 6. the ratio of the change in Y to the change in X