Question: what is the formula to find distance between 2 parallel lines?
Answer: Distance formula d = |a1x1+b1y1+c1| / √a12+b12 , where d is the distance between two parallel lines. x1 and y1 are the two intersection points of the lines with the axis in a cartesian plane, while a1 and b1 are the coefficients of variable x and y of the line.