A triangle can have at most 1 right angle, however depending on the triangle the may not be any.
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No right triangle can have any obtuse angles inside it.
An obtuse triangle can have no right angles, and has two equal angles.
A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)
Since a triangle has 3 angles that total 180 degrees, it can have only 1 right angle. Since a triangle has 180 degrees and 3 angles, it can only have 1 right angle.
A triangle can have a maximum of 1 right angle!