If you're talking a plane ie 2-dimensional figure, then like ALL four sided shapes, the interior angles total 360 degrees.
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The interior angles of a regular hexagon measure 120° A regular hexagon has all sides the same length and all angles are equal.
The equation for the total interior angles of a polygon is (n-2)x180. In this case, the shape has 56 sides. Thus, to work out the total interior angles of the shape you do: (56-2)x180 =54x180 =9,720. Therefore the total interior angles for a 56 sided shape is 9,720.
The sum of all three interior angles of any triangle, isosceles or not, is 180 degrees.
Whether you are talking about the measure of each interior angle, or the total of all the interior angles, there is no largest. The more sides a regular polygon has, the larger it angles will be. As the number of sides grows without bound, the measure of each interior angle gets closer and closer to 180 degrees, and the polygon looks more and more like a circle. The sum of the interior angles increases by 180 degrees every time you add a side.
(((2 x 11) - 4) x 90)/11 = ( 18 x 90)/11 = 147.27o (The total of the interior angles of an n-sided polygon is (2n - 4) right angles or 180n - 360 degrees)