Such a triangle can have any non-reflex angle - subject to the three angles of the triangle adding to 180 degrees.
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The interior angles of a 12 sided polygon add up to: (12-2)*180 = 1800 degrees
1800 degrees (that is the sum of the internal angles of the 12-sided polygon).
Exterior angles = 360 degrees Interior angles = 1800 degrees
The interior angles add up to 1800 degrees
The interior angles of a 12 sided polygon add up to 1800 degrees