Providing that it is a regular 10 sided decagon then each interior angle is 144 degrees
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Not normally but if it was an irregular decagon then it's quite possible.
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
The 10 interior angles of a decagon add up to 1440 degrees
144 degrees.
A decagon has 10 sides and 10 angles.