Assuming it is a two dimensional shape, 12 sides implies 12 angles (interior or exterior).
52 angles.
A heptagon (7-sided shape) has: 7 angles.
A 6 sided shape (hexagon) would have 6 interior angles of 120 degrees (assuming it is regular)
1260
The interior angles of an 11 sided polygon add up to 1620 degrees
The interior angles in a quadrilateral (4 sided shape) add up to 360 degrees.
The formula is: (n-2)*180 = sum of interior angles
A dodecagon is a 12 sided shape that has 12 interior angles that add up to 1800 degrees and 12 exterior angles that add up to 360 degrees
In total all 4-sided, 2-dimensional shapes angles' add up to 360 degrees. Depending on the length, width and shape of the polygon.
Exterior angles add up to 360 degrees Interior angles add up to 540 degrees
The 4 interior angles of a quadrilateral add up to 360 degrees
8 because there are 180 degrees in a triangle and 8*180 = 1440 degrees The interior angles of a 10 sided shape add up to 1440 degrees