© examsiri.com
Question : 145 of 180
Marks:
+1,
-0
Solution:
The angle between two lines
==‌and‌== is given by
cosθ=| a1a2+b1b2+c1c2 |
| √a12+b12+c12√a22+b22+c22 |
=| 3×1+5×1+4×2 |
| √32+52+42√12+11+22 |
== ⇒
cosθ= ⇒
cosθ= ⇒
θ=cos−1() So, option (c) is correct.
© examsiri.com
Go to Question: