1.

The angle between the lines 2x – y + 3 = 0 and x + 2y + 3 = 0 is A. 90° B. 60° C. 45° D. 30°

Answer»

Let m1 and m2 be the slope of the lines 2x − y + 3 = 0 and x + 2y + 3 = 0, respectively. 

Let θ be the angle between them. 

Here, m1 = 2 and m2 = \(-\frac{1}{2}\)

∵ m1m2 = − 1 

Therefore, the angle between the given lines is 90°.


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