1800 degrees
(that is the sum of the internal angles of the 12-sided polygon).
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Degrees are used to measure angles, not the lengths of sides.
The interior angles of a 12 sided polygon add up to: (12-2)*180 = 1800 degrees
12 sided regular polygon.
Sum of exterior angles = 360 degrees If each one is 12 deg there must be 360/12 = 30 of them. So it is a 30 sided polygon.
it has 12 vertices