Put four playing cards on the table, as shown in Figure ①. Xiao Min rotates one of them by 180 to get the card as shown in Figure ②, so the card she rotates is () from the left.

The answer is a, the first one, box 10.

The four cards before and after the spin are exactly the same. At this time, it can be concluded that the cards rotated by Xiao Min must be the same after rotating 180 degrees. Of these four cards, only the square 10 rotation 180 degrees is the same.

Of the four cards, only the square 10 rotates 180, but if the other three cards rotate 180, the small pattern in the middle will be reversed. As can be seen from Figure 2, the other three pictures have not changed, so Xiao Min must be the first picture, block 10.

nature

The rotation of a graph is a positional movement in which each point on the graph moves by a fixed angle around a fixed point on the plane.

① The distance from the corresponding point to the center of rotation is equal.

(2) The included angle of the connecting line between the corresponding point and the rotation center is equal to the rotation angle.

③ The figures before and after rotation are congruent, that is, the size and shape of the figures before and after rotation have not changed.

④ The center of rotation is the only fixed point.

⑤ The included angle of a group of corresponding points is equal to the rotation angle.