yes 90 degrees no exception.
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Because they all have the same measure: 90 degrees.
A rectangle is the only such shape. Not sure about the "little" right angles: all right angles are of the same measure.
A square has all 4 sides the same length and its angles measure the same as well. A rhombus has all 4 sides the same length as well and the angles measure the same as well too.
All right angles measure 90 degrees, that is, one-quarter of a full circle. If the angle doesn't measure 90 degrees it isn't a right angle; all right angles are identical.
All right angles are the same.