As shown in the figure, if angle 2 equals 30 degrees and angle 1 equals 60 degrees, BM=2m can be obtained. Let's analyze the range where sheep can move, with OM as the dividing line. In the picture on the left, the range where sheep can move is a sector with O as the center and 5m as the radius. In the picture on the right, the range where sheep can move is a sector with B as the center and 2m as the radius, so the range where sheep can move is the area of the shadow in the picture.