If you mean an 11 sided polygon then its 11 interior angles add up to 1620 degrees
A nonagon aka enneagon
Two angles whose sum is 90 degrees are called complementary angles.
Those angles are called complementary.Those angles are called complementary.Those angles are called complementary.Those angles are called complementary.
Sum of adjacent angles on a straight line.
Angles that have a measure sum of 90.
The sum of the four interior angles is 360 degrees.
Complementary angles
They are supplimentary angles.
supplementary angles.
The sum is two straight angles or 360 degrees.
a convex polygon has 6 sides . What is the sum of the measure of its interior angles?
The sum of the exterior angles of ANY polygon is 360 degrees.