The sum of the interior angles of a dodecagon (not duo-decagon) is
(12 - 2)*180 = 1800 degrees.
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The interior angles add up to 900 degrees Exterior angles total 360 degrees.
The exterior angles of a heptagon add to 360 degrees The interior angles add to 900 degrees.
A trapezoid is a quadrilateral and like all quadrilaterals it will have a total sum of 360 degrees of interior angles.
A cube is made up of 6 sides. Each side has 4 angles,for a total of 24 angles. Since these angles are 90 degree angles, that would mean that there are 2,160 degrees in a cube.
if it is a polygon then the total interior angles will equal 1080. so ear angle will be 135 degrees.