The smallest angle of rotational symmetry for a regular polygon is 30°. How many sides does the regular polygon have?

A full rotation is 360°, and a regular polygon’s smallest rotational symmetry angle is 360° divided by its number of sides. Set 360° ÷ n = 30°, so n = 360 ÷ 30 = 12. The polygon has 12 sides, which is choice B, 12.

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