A dog is on a lead measuring 3 m. The other end is attached to a post in the middle of a garden. Using a scale of 1 cm = 1 m, shade the area the dog can reach.

A locus is a path formed by a point which moves according to a rule. The plural is loci. The runner is following a path. This path is a locus. A flowerbed runs along the grass between A and B.