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All triangles have 3 sides and 3 interior angles that add up to 180 degrees.

Equilateral triangles have 3 congruent sides.

Isosceles triangles have 2 congruent sides.

A right angle triangle can have 2 congruent sides if its interior angles are 90, 45, 45 degrees.

A scalene or an obtuse triangle has no congruent sides.

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