Math about triangle and plus

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Across
  1. 2. with the addition of
  2. 3. the total amout resulting from the addition of two or more numbers
  3. 8. a triangle whose three sides are all the same length
  4. 9. 5>3
  5. 11. A number to be added to another
  6. 12. 7>2
Down
  1. 1. a triangle in which two of the sides are the same length
  2. 4. a triangle whose sides are each a different length
  3. 5. 9>8
  4. 6. a triangle which has an angle of 90 degree
  5. 7. a quartifier meaning great in size or amount or extent or degree
  6. 10. put together