All polygons have the same number of sides as angles. So if there are 12 sides, thereare 12 angles.
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The sum of the interior angles of a 12 sided polygon add up to 1800 degrees.
If the 12-sided polygon is 'regular', then each of its exterior angles is 30 degrees. Whether the polygon is regular or not, all 12 of its exterior angles still add up to 360 degrees, but they may not all be equal.
The name of a 12 sided polygon is Dodecagon.
Any polygon can have two interior angles of 12 degrees. No polygon can have all its interior angles of 12 degrees.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon