A decagon has 10 sides, so it also has 10 angles. Each angle of a decagon is 36 degrees (360 degrees divided by 10). Therefore, a decagon has 10 angles of rotation symmetry.
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A decagon need not have any but the default number (1) of rotational symmetry. It can have rotational symmetry of order 2, 5 or 10.
It depends on whether or not the decagon is a perfect decagon or a complex decagon. However, a perfect decagon has no acute angles.
A decagon has ten vertices.
A regular decagon has rotational symmetry = 10.For irregular decagons, it could be less (either 2 or none.)
A diamond has two rotation symmetry. It is possible to have a diamond that does have four of rotation symmetry.
A decagon will always have its interior angles measure 1480