An interior angle of a decagon cam have anuy value in the range (0, 360) degrees excluding 180 degrees. The sum of all interior angles must be 1440 deg.
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There are 1440 degrees in a decagon.
1440 degrees
1440
A decagon is a 10 sided polygon. Exterior degrees total 360 Interior degrees total 1440
Each interior angle of a regular decagon is 144 degrees