An interior angle of a decagon can have any value in the range (0, 360) degrees - other than 180. The only requirement is that they all sum to 1440 deg.
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Not normally but if it was an irregular decagon then it's quite possible.
The 10 interior angles of a decagon add up to 1440 degrees
A decagon has 10 sides and 10 angles.
decagon
Decagon