Question

a parallelogram is transformed according to the rule (x, y)→(x, y). which is another way to state the transformation?
$r_{0,90^{circ}}$
$r_{0,180^{circ}}$
$r_{0,270^{circ}}$
$r_{0,360^{circ}}$

Explanation:

The transformation rule $(x,y)\to(x,y)$ means no change in the coordinates of the points of the parallelogram. A rotation of $360^{\circ}$ about the origin ($R_{0,360^{\circ}}$) brings a figure back to its original position, which is equivalent to no - transformation. Rotations of $90^{\circ}$, $180^{\circ}$, and $270^{\circ}$ change the orientation of the figure.

Answer:

D. $R_{0,360^{\circ}}$