References: 1  Royal College of Radiologists. 2  Swinson S, Tapp M, Brindley R, Chapman S, Offiah A, Johnson K. An audit of skeletal surveys for suspected non-accidental injury following publication of the British Society of Paediatric Radiology guidelines. 3  Offiah AC, Hall CM.
The question of distance between two straight lines arises only when they are parallel. The given lines are parallel. If the equations of parallel lines are ax + by + c = 0 and ax + by + c' = 0, then the perpendicular distance between them is given by. p = l c - c' l / sqrt ( a^2 + b^2 )
If a = 0 and b â  0, the line is horizontal and has equation y = - c / b. The distance from (x 0, y 0) to this line is measured along a vertical line segment of length | y 0 - (- c / b)| = | by 0 + c | / | b | in accordance with the formula.nowing the shortest distance from a point to a line can be useful in various situationsâfor example, finding the shortest distance to reach a road, quantifying the scatter on a graph, etc.