Question

how can you describe the transformation? slide flip turn

Explanation:

A "Turn" (rotation) transformation involves rotating a figure around a fixed point. Looking at the two triangles A and B, triangle A appears to have been rotated around the common vertex to form triangle B, which matches the concept of a turn. A "Slide" (translation) would move the figure without rotation, and a "Flip" (reflection) would mirror it, neither of which fits here as well as a turn.

Answer:

Turn