There are 54 diagonals in a 12 sided shape
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A regular 12 sided dodecagon has 54 diagonals.
54
A doedecagon is 12 sided, I am not sure if it would be correct to say it consists of line segments, but if it is, then 12. There are also 35 distinct diagonals that can be drawn from the vertices and the dodecagon can be divided up into 8 triangles by drawing the diagonals.
It is a dodecagon which has 12 sides Check: 0.5*(144-36) = 54 diagonals
A dodecagon has 12 sides.