On graph paper, plot $ABCD$ if $A(0,3)$, $B(2,5)$, $C(6,3)$, and $D(4,1)$.  

1. Rotate $ABCD$ $90º$ clockwise ($↻$) about the origin to form $A'B'C'D'$. Name the coordinates of $B'$.

   Answer (a):

   The coordinates of $B'$ are: $(5,-2)$

2. Translate $A'B'C'D'$ up $8$ units and left $7$ units to form $A''B''C''D''$. Name the coordinates of $C''$.

   Answer (b):

   The coordinates of $C''$ are: $(-4,2)$

3. After rotating $ABCD$ $180º$ to form $A'''B'''C'''D'''$, Arah noticed that the image lined up exactly with the original. In this case, about what point was $ABCD$ rotated? How did you find it?

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