There are two ways of doing it I'll tell you the easiest, you have to draw your dodecagon and then pick one specific corner and draw straight lines out to each of the other corners from this point and then Count how many triangles there are and times it by 180
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The interior angles of a 12 sided dodecagon add up to 1800 degrees
A dodecagon has 12 interior angles that add up to 1800 degrees.
The 12 interior angles of a dodecagon add up to 1800 degrees
The interior angles of a 12 sided dodecagon add up to 1800 degrees
Interior Angle: 150 degrees (Interior Angle Sum: 1800) Exterior Angle: 30 degrees (Exterior Angle Sum: 360)