Plot $\Delta ABC$on graph paper if $A(6, 3), B(2, 1),$ and $C(5, 7)$.   

1. $\Delta ABC$ is rotated about the origin $180º$ to become $\Delta A^\prime B^\prime C^\prime$. Name the coordinates of $A^\prime, B^\prime,$ and $C^\prime$.

2. This time $\Delta ABC$ is rotated $180º$ about point $C$ to form $\Delta A^{\prime \prime}B^{\prime \prime}C^{\prime \prime}$. Name the coordinates of $B^{\prime \prime}$.

3. If $\Delta ABC$ is rotated $90º$ clockwise (↻) about the origin to form $ΔA^{\prime \prime \prime}B^{\prime \prime \prime}C^{\prime \prime \prime},$ what are the coordinates of point $A^{\prime \prime \prime}$?