TRIANGLE CONCEPTS

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Across
  1. 2. longest side
  2. 4. perpendicular line segment from vertex to opposite side
  3. 5. line segment joining vertex to mid point of opposite side
  4. 7. angles between 90 to 180 degree
  5. 9. two sides equal
Down
  1. 1. angles less than 90 degree
  2. 3. square on hypotenuse = sum of squares on its legs
  3. 6. no side equal
  4. 8. all angles equal