Arectangle is always mapped onto itself if it is rotated a) 60° b) 90° c) 120° d) 180°

- D is the right answer . A rectangle is always mapped onto itself if it is rotated 180°.

Explanation:-

A shape has rotational symmetry if it maps onto itself under rotation at its center about  a point . The order of rotational symmetry is the total number of times the figure maps onto itself during a rotation of 360°.

A rectangle has an order of symmetry =2

Thus a rectangle is always mapped onto itself if it is rotated .

Ireally don’t understand your problem do you have a better picture of it

Iam not good at math i wish i could