Triangles

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Across
  1. 2. one of the angles in a right angled triangle
  2. 4. figure with three sides
  3. 5. an angle greater than 0 degree but less than 90 deg
  4. 6. two sides are equal
  5. 7. all sides are unequal
Down
  1. 1. sum of all angles of a triangle
  2. 3. all sides are equal