Since triangle ABC is congruent to triangle DEF... - angle A is congruent to angle D - angle B is congruent to angle E - angle C is congruent to angle F
Since angle B is congruentto angle E, and since angle E is 25 degrees, we can say that the measure of angle B is also 25 degrees.
The angle measures of a triangle sum to 180 degrees, so we can subtract the two given angle measures from 180.