They can be.
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Its not possible to have less than 4 four side that the most idiotic question i ever heard, No Sides, No Angles.
No not ever because the 3 interior angles of any triangle add up to 180 degrees and so an obtuse triangle will have 1 obtuse and 2 acute angles.
Could a traingle and a rectangle ever be congruent? Explain.
Yes. Two angles are compliments ("complimentary angles") if they add up to 90 degrees. E.g. 40 degrees and 50 degrees are compliments to one another. A 45 degree angle and another 45 degree angle are both complimentary and congruent (same angle).