120, if it is a polygon.
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6 (hexagon)
If each interior angle measures 120 degrees then it is an hexagon which has 6 sides
A hexagon has six equal interior angles and six equal exterior sides. Each interior angle is 120 degrees, making the total internal angles equal to 720 degrees.
180o. If the exterior angles are 120 the number of sides is 360/120 ie 3 so it's a triangle.
A regular polygon having an interior angle of 120 degrees will have 6 sides and is called an hexagon.