An isosceles trapezium in Euclidean space is a curved polyhedral with an asymmetry connection bisecting a couple of opposites, and the further discussion can be defined as follows:
- It also can be defined as a trapezium where both legs and the two basic angles have the same size.
- The number of sides is four in an isosceles trapezoid.
- Both opposites (bases) are equal in length but are not parallel to each other and the other two sides.
- The trapezoid has a reflective symmetry line.
- The symmetry of the trapezoid of rotation is 1.
- The symmetry line is upright.
Therefore the final answer is "first, third and fifth choice".
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