Question

Which transformation will always map a parallelogram onto itself?

Answer 1

Answer: a 180° rotation about its center

Step-by-step explanation:

A parallelogram has rotational symmetry of order 2.

Thus, rotation transformation maps a parallelogram onto itself 2 times during a rotation of $360^{\circ}$ about its center.

And that is at $180^{\circ}$ and $360^{\circ}$ about its center.

Therefore, a 180° rotation about its center will always map a parallelogram onto itself .

1. A figure has rotational symmetry when it can be rotated and it still appears exactly the same.
2. The order of rotational symmetry of a shape is the number of times it can be rotated around $360^{\circ}$ and still appear the same.

Answer 2

"A 180° rotation about its center" is the one transformation among the following choices given in the question that will always map a parallelogram onto itself. The correct option among all the options that are given in the question is the third option or the penultimate option. I hope it helps you.