Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
The diagonals of a $\mathrm{II} \mathrm{gm}$ are represented by the vectors $\overrightarrow{\mathrm{d}_{1}}=(3 \hat{\mathrm{i}}+\hat{\mathrm{j}}-2 \hat{\mathrm{k}})$ and $\overrightarrow{\mathrm{d}_{2}}=(\hat{\mathrm{i}}-3 \hat{\mathrm{j}}+4 \hat{\mathrm{k}})$ The area of the II gm is
A. $7 \sqrt{3}$ sq units
B. $5 \sqrt{3}$ sq units
C. $3 \sqrt{5}$ sq units
D. none of these
Solution:
