11 and 89 aren't complementary angles because complementary angles form a right angle (90 degrees), but 89 and 11 add up to 100 and not 90.
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1620 degrees
The interior angles of an 11-gon add up to 1620 degrees
360 degrees
The interior angles of an 11 sided polygon add up to 1620 degrees
Providing that it is a regular 11 sided polygon then its 11 interior angles add up to 1620 degrees and each interior angle is 1620/11