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Math Question

Triangle \( A B C \) has the following vertices:
\[
\begin{array}{l}
\text { - } A(1,9) \\
\text { - } B(11,-7) \\
\text { - } C(-9,3)
\end{array}
\]
Is triangle \( A B C \) a right triangle, and why?
Choose 1 answer:
(A) Yes, because \( \overline{A B} \perp \overline{A C} \).
(B) Yes, because \( \overline{A B} \perp \overline{B C} \).
(C) No, because \( \overline{A B} \) is longer than \( \overline{A C} \).
(D) No, because \( \triangle A B C \) doesn't have a pair of perpendicular sides.

Solution

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