The anchor ring $A$ is by definition the set of points of the form
$(\cos θ(2 + \cos ϕ),\sin θ (2 + \cos ϕ),\sin ϕ) , θ, ϕ ∈ \mathbb R$ , in $\mathbb R^3$
Construct a homeomorphism from $A$ to the torus $T^2$.
Honestly not too sure where to start any help would be greatly appreciated.