What is a quadrilateral that has both reflectional and rotational symmetry?

1 answer

A rhombus has rotational symmetry for a 180 degree rotation about the center, and reflection symmetry about an axis along a diagonal.

A square, which is a rhombus, has additional reflection symmetries through lines that bisect sides, and for 90 degree rotations.

A rhombus is a broader class of figures than squares.