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complementary angles add up to 90 degrees so it will be 11 degrees
It is: 1620 degrees
Total of interior angles is 22 - 4 right angles so hendecagon angles would be 18 x 90/11 ie 147.27 degrees.
The sum of the internal angles is 180*(11 - 2) = 180*9 = 1620 degrees. The sum of the external angles is 360 degrees - irrespective of the number of sides.
The formula to find the sum of the angles of any shape is: (sideCount-2)*180 If the shape has 11 sides the total interior angle is: 1620.