An obtuse angle
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A 120-degree angle is an obtuse angle, meaning it is greater than 90 degrees but less than 180 degrees. It is formed when two lines intersect and the angle between them measures 120 degrees. In a triangle, a 120-degree angle would typically be found at one of the vertices.
An obtuse angled triangle can have can have one internal angle of 120 degrees.
The supplement to that angle is 60 degrees.
180-120-35 = 25 degrees
120 degrees