The bisector of this angle makes an angle of 60 degrees with its side. The corner adjacent to the given corner.

1) The bisector of an angle bisects the angle => the whole angle will be = 2 x 60 degrees = 120 degrees.

2) we know that the sum of adjacent angles = 180 degrees (by the theorem on adjacent angles). Therefore, the desired angle will be = 180 – 120 = 60 degrees.

Answer: 60 degrees



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