Question 3 • (A. Costello)WCA 5324 Geometry 1st Nine Weeks 26-27
A regular 15-sided polygon matches itself after each rotation of 360° ÷ 15 = 24°, or any whole-number multiple of 24°. Since 72° = 3 × 24°, it is a possible angle of rotational symmetry. The other choices are not whole-number multiples of 24°.
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