The internal angles are 144 degrees.
The external angles are 36 degrees.
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Oh, dude, a decagon has 10 sides, right? So, each angle in a regular decagon measures 144 degrees. Now, a right angle is 90 degrees, so technically, there are zero right angles in a decagon. But hey, who's counting, right?
''Decagon'' is any polygon with ten sides and ten angles ''Regular decagon'' is a polygon with ten sides of equal length and all angles equal to 144°
1440
There can be 10 obtuse angles. If there are no reflex angles there can by up to three acute angles (I think).
a decagon