It is an angle that has a turn of less than 360 degrees which is a full turn.
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Rotational Symmetry.
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It is an acute angle in geometry because it's greater than 0 but less than 90 degrees
Assuming you are referring to a triangle. In Euclidean, or plane geometry, always to 180 degrees. In non-Euclidean geometry either more or less than 180 degrees.
Rotation Symmetry La Simetria de Rotation Symetrie de Rotation