The angles of any triangle add to 180 degrees. Whether or not the triangle is in a decagon is totally irrelevant.
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There are 1440 degrees in a decagon.
216.
Each triangle has 180 degrees on the inside angles.
144 degrees. from the triangle (180 degrees) to find the degrees of shapes with one more side, add 180 degrees. e.g. triangle (3 sides) - 180 degrees quadrilateral (4 sides) - 180 + 180 = 360 degrees
60 degrees in each angle