A) 20
B) 65
C) 52
D) 26
Correct Answer: B
Solution :
\[{{d}_{1}}\times {{d}_{2}}=\left| \begin{matrix} i & j & k \\ 8 & -6 & 0 \\ 3 & 4 & -12 \\ \end{matrix} \right|\]\[=72\hat{i}-(-96)\hat{j}+50\hat{k}\] \[=5178+7056+2500\] \[|{{d}_{1}}\times {{d}_{2}}|=\sqrt{16900}=130\] \[A=\frac{1}{2}|{{d}_{1}}\times {{d}_{2}}|=\frac{1}{2}\times 130\]= 65You need to login to perform this action.
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