0 or 1.
A right triangle has one right angle. All other triangles have zero right angles.
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0. A right triangle, by definition, will never include any obtuse angles.
1.
A triangle is composed of 180 degrees. Two right angles = 180 degrees, the total number for all angles in a triangle. Thus a triangle can not have more than one right angle. l____________l <------ This is what two right angles look like, as you can see it cannot ever be a triangle.
A triangle can never have three right angles
In a right angled triangle the two other angles are acute.