A right triangle has one angle that measures 65°. What is the measure of the other acute angle?

The other angle is 25 degrees.

This is because the sum of all angles must add up to 180. To find the last angle, you must subtract the other angles you know from 180. We know the angle measurements are 65 and 90 (a right angle is 90)

180 - (65+90) = 25