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Questions  >>  Olympiad-Math  >>  Class 10
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Q)

The vertices of a triangle are $(1,k),(4,-3)$ and $(-9,7)$ and its area is 15 sq.units , then the value of k is

$\begin{array}{1 1}(A) \;3\;or\;\large\frac{-21}{13} \\(B)\;-3\;or\;\large\frac{-21}{13} \\(C)\;-3\;or\;\large\frac{21}{13} \\(D)\;3\;or\;\large\frac{21}{13} \end{array}$

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