complementary angles
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The measures of the interior angles of a hexagon add up to 720 degrees.
Two right angles (90 degrees each) equal 180 degrees (a straight angle).
The sum of the exterior angles of a polygon add up to 360 degrees.
Total sum add up to 360 degrees.
A 13 sided polygon also called a triskaidecagon or tridecaogn has a total 1980 degrees for its interior angles.