Triangles

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Across
  1. 5. a triangle having two sides equal
  2. 6. a triangle each whose angles measures less than 90 degrees
  3. 7. a triangle having all sides equal
Down
  1. 1. a triangle one whose angle measures more than 90 degrees
  2. 2. a triangle whose one angle measures 90 degrees
  3. 3. a triangle having three sides of different lengths
  4. 4. the sum of the sides of a triangle