Math Definitions

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Across
  1. 2. going up
  2. 4. going up
  3. 5. going down
  4. 6. radius x 2
  5. 8. made up of degrees
Down
  1. 1. diameter divide by 2
  2. 3. going down
  3. 4. math which includes letters and symbols
  4. 7. an accurate guess