my answer is R
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If you mean which alphabet letter, an L has one right angle; a T has a right and left acute angle.
No it is impossible for a right triangle to have an obtuse angle therefore it will have one right angle and two acute angles.
yes. to be and acute angle, all angles must be acute. Obtuse angles only one angle has to be obtuse. Right angles only need one too. Acute has to have every angle to be acute, if one angle is obtuse or right, it's automatically no an acute Angle anymore.
A right-triangle has a right angle (90o) and two acute angles.
A right triangle has one angle a right angle (90o) An obtuse triangle has one angle an obtuse angle (> 90o) An acute triangle has all angles acute (< 90o)