Find any straight side of the decagon. Move along it until it joins another side. That is where an angle is.
An angle of a decagon can have any measure between 0 and 360 degrees (except 180 degrees).
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Each interior angle of a regular decagon is 144 degrees
A decagon is a polygon with 10 sides. By using the interior and exterior postulates, you can find the angle measures, which happen to be 144 and 36 degrees respectively.
360/10 = 36 degrees
Each interior angle of a regular 10 sided decagon measures 144 degrees
Providing that it's a regular decagon then each exterior angle will measure 36 degrees