JAMB 2014 · UTME · Q31

The locus of a dog tethered to a pole with a rope of $4\text{ m}$ is a

Worked solution (try it first)

With the rope pulled tight, the dog is always 4 m from the pole.
Points at a fixed distance from a point form a circle, so the locus is a circle with radius 4 m, option C.