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 )
Finding the gradient of straight lines. Sometimes you are given a graph of a straight line and you need to find its gradient. To find the gradient of a straight line: 1  choose any two points on the line. 2  draw a right-angled triangle with the line as hypotenuse. 3  use the scale on each axis to find the triangle's:4  vertical length.5  horizontal length. 6  work out the vertical length Ã· horizontal length.inding the gradient of straight lines. Sometimes you are given a graph of a straight line and you need to find its gradient. To find the gradient of a straight line: 1  choose any two points on the line. 2  draw a right-angled triangle with the line as hypotenuse. 3  use the scale on each axis to find the triangle's: