Is it possible to draw a reflex angle so the other angle formed by the arm is acute?

No, it is not possible to draw a reflex angle where the other angle formed by the arm is acute. A reflex angle measures between 180 and 360 degrees, while an acute angle measures less than 90 degrees. Therefore, the other angle formed by the arm in a reflex angle scenario would have to be obtuse, measuring between 90 and 180 degrees.