An equilateral triangle.
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A 120 degree angle is obtuse because it is greater than 90 but less than 180 degrees and it is 1/3 of a full turn.
A regular hexagon.
It is: 120 degrees
Exterior angle = 360/120 = 3 degrees. So interior angle = 180-3 = 177 degrees.
From each vertex to its opposite vertex. These will be centered on a shared point at the center of the hexagon. Each complete line will be a line of symmetry for the hexagon.