Math about triangle and plus

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Across
  1. 2. a triangle whose sides are each a different length
  2. 5. put together
  3. 8. a triangle whose three sides are all the same length
  4. 11. 9>8
Down
  1. 1. a quartifier meaning great in size or amount or extent or degree
  2. 2. the total amout resulting from the addition of two or more numbers
  3. 3. a triangle in which two of the sides are the same length
  4. 4. 5>3
  5. 6. a triangle which has an angle of 90 degree
  6. 7. with the addition of
  7. 9. A number to be added to another
  8. 10. 7>2