36 degrees
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First of all, a decagon is a polygon with 10 sides. A regular decagon is a decagon in which all of the sides and angles are equal. Since there are 360o in a complete rotation, you can simply divide 360o by 10. 360o / 10 = 36o
Interior angles add up to 1440 degrees Exterior angles add up to 360 degrees
Not normally but if it was an irregular decagon then it's quite possible.
Each interior angle measures 144 degrees
The 10 interior angles of a decagon add up to 1440 degrees