Dodecagon
A dodecagon is a 12-sided polygon. The sum of its internal angles is . Each of its exterior angles has measure .
A regular dodecagon can be seen below:
The area of a regular dodecagon can be calculated by the formula , where is the circumradius of the dodecagon. In this case, would be . Also, each small triangle (, , etc.) is congruent, so (etc) .
See Also
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