The distance between the lines ax+by+c1=0ax + by + c_1 = 0ax+by+c1=0 and ax+by+c2=0ax + by + c_2 = 0ax+by+c2=0 is given by:
∣c1−c2∣a2+b2\frac{|c_1 - c_2|}{\sqrt{a^2 + b^2}}a2+b2∣c1−c2∣
∣c1+c2∣a2+b2\frac{|c_1 + c_2|}{\sqrt{a^2 + b^2}}a2+b2∣c1+c2∣
∣c1−c2∣a2+b2\frac{|c_1 - c_2|}{a^2 + b^2}a2+b2∣c1−c2∣
c1−c2a2+b2\frac{c_1 - c_2}{\sqrt{a^2 + b^2}}a2+b2c1−c2