A decagon has 10 sides, and the whole polygon has 360 degrees, so each angle is 36 degrees.
It depends on whether or not the decagon is a perfect decagon or a complex decagon. However, a perfect decagon has no acute angles.
144
There are no right angles in a regular decagon. On a regular decagon, the angles are 144 degrees, where as right angles are ninty.
Interior angles add up to 1440 degreesEach interior angle of a regular decagon measures 144 degrees