A guinea pig in a large field is tethered to one end of a 10 metre rope. The other end of the rope is attached to a ring which i
s free to slide along a fixed horizontal rail, 10 metres long, in the middle of the field. Which diagram shows the shape of the part of the field that the guinea pig can reach?
If the rail is ten meters long, and the rope is 10 meters long, they can travel 10 meters left of the rail, ten meters along the rail, ten meters right of the rail, and ten meters above the rail.