The angle of rotation and order of the figures are as follows
angle of rotation order
a. 60 6
b. 180 2
c. 180 2
d. 0 -
What is rotational symmetry
Rotational symmetry is a geometric property of a figure that describes its ability to appear unchanged after a rotation about a central point.
A figure exhibits rotational symmetry if after a certain angle of rotation around its center it aligns with its original position.
The figure in d has no rotational symmetry. There is rotation that will the shape to align to the original position