Question:
Mark against the correct answer in each of the following:
The length of perpendicular from the origin to the plane $\overrightarrow{\mathrm{r}} \cdot(3 \hat{\mathrm{i}}-4 \hat{\mathrm{j}}-12 \hat{\mathrm{k}})+39=0$ is
A. 3 units
B. $\frac{13}{5}$ units
C. $\frac{5}{3}$ units
D. None of these
Solution:
