Three Dimensional Geometry Question 237
Question: The angle between the straight lines $ \frac{x+1}{2}=\frac{y-2}{5}=\frac{z+3}{4} $ and $ \frac{x-1}{1}=\frac{y+2}{2}=\frac{z-3}{-3} $ is
[MP PET 2000]
Options:
A) $ 45{}^\circ $
B) $ 30{}^\circ $
C) $ 60{}^\circ $
D) $ 90{}^\circ $
Show Answer
Answer:
Correct Answer: D
Solution:
$ \theta ={{\cos }^{-1}}\frac{(2+10-12)}{\sqrt{4+25+16}\sqrt{1+4+9}},={{\cos }^{-1}}(0) $
Þ $ \theta =90^{o} $ .
BETA
