Answer:
D. 60°
Step-by-step explanation:
A regular hexagon has 6 equal sides and 6 equal angles.
To rotate the Octagon onto itself, we have to rotate each of those sides to an adjacent side. This happens when the angle of turn is \(\dfrac{1}{6}\)th of a full-circle turn.
A circle has \(360^{\circ}\) and \(\dfrac{1}{6}\times 360^{\circ}=60^{\circ}\)
A 60° rotation clockwise or counterclockwise puts each of the edges over the position where an adjacent edge was located.
