Question

# The angle between the lines 2x − y + 3 = 0 and x + 2y + 3 = 0 is (a) 90° (b) 60° (c) 45° (d) 30° (e) 180°

Solution

## (a) 90° Let be the slope of the lines 2x − y + 3 = 0 and x + 2y + 3 = 0, respectively. Let $\theta$ be the angle between them. Here, $\because {m}_{1}{m}_{2}=-1$ Therefore, the angle between the given lines is 90°.MathematicsRD Sharma XI (2015)Standard XI

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