It has 20 vertices or angles.
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No! A dodecagon has 12 vertices. A polygon with 20 vertices is an icosagon.
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The shape of the twelfth figure is a dodecagon. A dodecagon is a polygon with twelve sides and twelve angles. It is a regular dodecagon if all its sides and angles are equal. The interior angles of a regular dodecagon measure 150 degrees each.
A regular or an irregular dodecagon both have 12 sides
A regular 12 sided dodecagon has 54 diagonals.
Each exterior angle is 30 degrees and each interior angle is 150 degrees
Sum of exterior angles of an n-gon is 360 degrees. A dodecagon has 12 exterior angles which are all equal and so each is 360/12 = 30 degrees.