A dodecagon has 12 sides. Whether or not from one vertex, the number of sides remains the same. Each vertex is formed when 2 sides meet.
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Assuming the shape is a regular dodecagon, with 12 angles and lengths the same, a dodecagon with sides of 9.25 centimetres has a perimeter of 9.25 x 12 = 110 centimetres.
A dodecagon is a two-dimensional shape and so has only one face.
112
There can be 14 lines in a seven side shape * * * * * That is the total number of diagonals from ALL vertices. Not what the question asked, though. From one vertex, there can be 4. One to every other vertex except for itself and one each on either side.
A dodecagon prism has two decagonal bases which are parallel and congruent to one another. They are joined together by 12 rectangular faces.