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Are you talking about the angle A. If you are then at what point of the triangle is the angle A.
It must be 65 degrees because there are 180 degrees in a triangle. 90+25+65 = 180
The sum of the internal angles of a triangle is 180º. If B is a right angle it has 90º, so there are only 90º left for the other two angles, meaning that they cannot be right!
The sum of the two angles is 360. So angle ABC = 120 degrees.
Is angle C 90 degrees or 80 degrees?