((180 x 24) - 360)/24
= 3960/24
= 165o
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The exterior angles of any polygon add up to 360. 360/15 = 24
The interior angles of a 19 sided polygon add up to 3060 degrees
The interior angles of a 20 sided polygon add up to 3240 degrees
The interior angles of an 11 sided polygon add up to 1620 degrees
A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.