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Across
  1. 1. an arithmetic operation in which the difference between two numbers is calculated
  2. 3. number that is added to another number (the augend)
  3. 6. angle, an angle between 90 and 180 degrees
  4. 8. angle,the 90 degree angle between two perpendicular lines
  5. 9. the arithmetic operation of summing
  6. 10. angle,an angle greater than 180 degrees (but less than 360)
  7. 12. side of a right triangle opposite the right angle
  8. 13. an arithmetic operation that is the inverse of division
Down
  1. 1. than, two more than two is four
  2. 2. angle,an angle of 180 degrees
  3. 4. number by which a dividend is divided
  4. 5. lowest part of sth
  5. 7. whole amount
  6. 11. four straught equal sides and four angles of 90