None. A triangle can only have one right angle.
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An obtuse triangle can have no right angles, and has two equal angles.
Unless it is a right isosceles triangle, a normal right triangle has no pairs of equal sides.
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 square has 2 pairs of right angles and its 4 right angles add up to 360 degrees