The sum of all the interior angles is 720 degrees.
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The degrees in a 19 sided polygon add up to 3,060 degrees
The interior angles of an 11 sided polygon add up to 1620 degrees
It has 540 degrees because a five sided polygon has three triangles in it, and sinnce a triangle equals 180 degrees, 3 x 180= 540.
A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
An 11 sided polygon has interior angles that add up to 1620 degrees