A dodecagon is a plane figure which is bounded by 12 straight sides. The sides may all be of different lengths. It has 12 vertices (corners) and the interior angle can have any value in the range (0, 360) degrees with the only condition being that their sum is 1800 degrees. A dodecagon has 54 diagonals.
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A dodecagon has 12 sides.
The interior angles of a dodecagon sum to 1800 degrees.
The interior angles of a dodecagon sum to 1800 degrees.
The interior angles of a dodecagon sum to 1800 degrees.
A dodecagon is a two-dimensional shape and so has only one face.