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.
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(number of sides - 2)*180 = total sum of interior angles
Right angles are 90°. The total measure of a triangle is 180°. So, the sum of the other two angles must equal 90°.
Calculate the fourth angle so that the sum of the angles is 360 degrees.Calculate the fourth angle so that the sum of the angles is 360 degrees.Calculate the fourth angle so that the sum of the angles is 360 degrees.Calculate the fourth angle so that the sum of the angles is 360 degrees.
All exterior angles of any polygon sum to 360 deg. If there are 9 angles then each angle is 40 degrees.
The interior angles of a dodecagon sum to 1800 degrees.