Discover the Secret to Adding Columns in Excel That Experts Wont Tell You!

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Solution: A regular 12-sided polygon (dodecagon) has rotational symmetry of order 12. The full set of rotational symmetries consists of rotations by multiples of $ \frac{360^\circ}{12} = 30^\circ $. These rotations are: $ 0^\circ, 30^\circ, 60^\circ, \dots, 330^\circ $. This forms an arithmetic sequence with first term $ 0^\circ $, common difference $ 30^\circ $, and 12 terms. The sum of an arithmetic sequence is given by:
S = \frac{n}{2}(a + l) = \frac{12}{2}(0^\circ + 330^\circ) = 6 \cdot 330^\circ = 1980^\circ
Thus, the sum of all distinct rotational symmetries is $ \boxed{1980^\circ} $.

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