If $A(2, 9)$,$B(-2, 1)$,and $C(6, 3)$ are vertices of a triangle and the area of $\Delta ABC$ is $28$,find the length of the altitude drawn from $A$ to the side $\overline{BC}$.

  • A
    $\frac{21}{\sqrt{17}}$
  • B
    $\frac{28}{\sqrt{10}}$
  • C
    $\frac{20}{\sqrt{17}}$
  • D
    $\frac{28}{\sqrt{17}}$

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