Three Dimensional Geometry Question 88
Question: The projections of a line on the co-ordinate axes are 4, 6, 12. The direction cosines of the line are
Options:
A) $ \frac{2}{7},\frac{3}{7},\frac{6}{7} $
B) 2, 3, 6
C) $ \frac{2}{11},\frac{3}{11},\frac{6}{11} $
D) None of these
Show Answer
Answer:
Correct Answer: A
Solution:
Direction cosines $ =( \frac{4}{\sqrt{16+36+144}},\frac{6}{14},\frac{12}{14} ) $ or $ ( \frac{2}{7},\frac{3}{7},\frac{6}{7} ) $ .
BETA
