Question

how would you move the green shape exactly over the gray shape using the fewest moves? check only necessary moves.
a. turn
b. slide
c. flip

Explanation:

The green shape and the gray shape have different orientations. To make the green shape match the gray shape's orientation, a turn (rotation) is needed. Sliding (translation) alone won't change the orientation. Flipping (reflection) would create a mirror - image, which is not the case here as the gray shape is a rotated version (not a reflected one) of the green shape.

Answer:

A. Turn