A right-triangle has a right angle (90o) and two acute angles.
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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 trapezoid contains either:two acute angles and two obtuse angles orone acute angle, one obtuse angle and two right angles.
A scalene triangle could have three acute angles, one right angle and two acute angles, or one obtuse angle and two acute angles.
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.