Answer:
X+2
Step-by-step explanation:
B is yes and the rest are no. B is the only solution where y equals 1.
X = <u> </u><u>2</u><u> </u><u> </u>cm
Y =<u> </u><u>1</u><u>. </u>cm
Check me if I'm Wrong.
The image would coincide with the pre-image during the rotation. Therefore, the octagon would coincide a total of 8 times as it rotates 360 degrees about its center.