Rotation 90
A rotation is a figure that moves around a fixed point called the center of rotation. Each vertex must contain the same degree and same direction around the center of rotation. I know this is a rotation 90 degrees because it has a center of rotation (point F), every vertex has the same degree and direction from the center point and lastly the coordinates from the pre-image changed from (x,y) to (-y,x) in the final image.

Information: Rotation