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Sum of exterior angles = 360 degrees Sum of interior angles = 1440 degrees
There are 10
A regular 12 sided polygon each interior angle measures 150 degrees
The sum of the interior angles of a n-gon is (n-2)*180 So, (n-2)*180 = 1800 ie n-2 = 10 so that n = 12 It is a 12 sided polygon or dodecagon.
The sum of the exterior angles of a regular polygon equal 360° . If one such angle measures 36° then the polygon has 360/36 = 10 sides.