Distance between parallel lines (Parallel lines ax+by+c1=0 and ax+by+c2=0 separated by this distance.)

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Parallel lines ax+by+c1=0 and ax+by+c2=0 separated by this distance.

What each symbol means

SymbolWhat it stands for
a,bSame coefficients on x,y
c1,c2Constants differing between the two lines

When to use this

Same a,b on both lines (not just proportional typo).