Just one of them and two acute angles that add up to 90 degrees.
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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)
No right triangle can have any obtuse angles inside it.
A triangle can have a maximum of 1 right angle!
it depends on what type of triangle