Question

What is the distance between the lines 3x-4y+7=0 and 3x-4y+5=0?

(a) 1 unit

(b) 0.5 unit

(c) 0.8 unit

(d) 0.4 unit

This question was addressed to me at a job interview.

Question is taken from Computational Geometry in section Computational Geometry of Data Structures & Algorithms II

Answer 1

The correct option is (d) 0.4 unit

Explanation: As the given lines are parallel so the distance between them can be calculated by using the formula (c1-c2)/(√a^2+b^2). So we get the distance as 0.4 unit.