Triangles

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Across
  1. 4. Triangles which one angle is a right angle
  2. 5. Triangle which all sides and angles are congruent
  3. 6. Two sides and the two angles opposite these sides are congruent
Down
  1. 1. Triangle which no sides and no angles are congruent
  2. 2. Triangles which one angles is obtuse
  3. 3. triangle which all the angles are acute