examples of Chow rings

\({\operatorname{CH}}({\mathbf{A}}^n_{/ {k}} ) = {\mathbf{Z}}[{\mathbf{A}}^n]\).
\({\operatorname{CH}}({\mathbf{P}}^n_{/ {k}} ) \cong {\mathbf{Z}}[H]/\left\langle{H^{n+1}}\right\rangle\) where \(H\) is the class of a