triangle

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Across
  1. 4. the longest side of right triangle
  2. 5. all angles are of same length
  3. 6. a 3d shape related to it
  4. 8. 2 sides is of same length
Down
  1. 1. all sides are of different length
  2. 2. discovered formula for area of triangle
  3. 3. corner of triangle
  4. 7. space the shape covers