Assuming it is a two dimensional shape, 12 sides implies 12 angles (interior or exterior).
52 angles.
A 6 sided shape (hexagon) would have 6 interior angles of 120 degrees (assuming it is regular)
A heptagon (7-sided shape) has: 7 angles.
1260
The interior angles of an 11 sided polygon add up to 1620 degrees
An irregular four-sided shape, or quadrilateral, can have anywhere from zero to four right angles. The specific number of right angles depends on the individual angles of the shape; for example, a rectangle has four right angles, while a trapezoid may have none. Thus, the count of right angles in an irregular quadrilateral can vary widely.
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