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A right angled triangle can only have two acute angles.
The theorem states "If two angles are both supplementary and congruent, then they are right angles."
Perpendicular lines make four 90 degree angles otherwise known as right angles.
The two angles, other than the right angle itself, MUST be complementary.
Any non-regular polygon from pentagon and up can have two or more right angles. Take a square and chop off the top and then make a two more connecting line segments (like a house with roof), and you have an irregular pentagon with 2 right angles at the bottom, for example.