Pythagorean Puzzle

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Across
  1. 2. a^2+b^2=c^2
  2. 3. triangle a triangle with a 90 degree angle
  3. 4. the numbers that are almost always found after finding the hypotenuse
  4. 5. longest line in any right triangle
Down
  1. 1. the thing that represents the missing length
  2. 6. root ^2