Crossword Puzzle

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Across
  1. 2. The answer after addition of 2 numbers
  2. 4. part of a whole
  3. 5. angle exactly equal to 90 degrees
  4. 6. triangle in which all sides are equal
  5. 7. longest side of a triangle
Down
  1. 1. Angle less than 90 degrees
  2. 3. the answer after subtraction of 2 numbers