Hi! My problem sounds as following: In the isoscele triangle [itex]\triangle ABC[/itex], [itex]\angle A[/itex] = 48 degrees. Bisect the angle [itex]\angle A[/itex] against [itex]\overline CB[/itex] in point T. Determine the [itex]\angle ATB[/itex] for the three possible solutions. I've found two of them, but cannot find the last. The first one is if you pick A as one of the conjugent angles and then you get [itex]\angle ATB[/itex] = 108 degrees. The second one you find if you select the top angle and then get [itex]\angle ATB[/itex] = 90 degrees.