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The distance between Ax + By + C1 = 0 and Ax + By + C2 = 0 is
A|C1 – C2|/√(A² + B²)
B|C1 – C2|/(A + B)
C|C1 – C2|/(A² + B²)
D|C1 + C2|/√(A² + B²)
Answer & Solution
Correct answer: A. |C1 – C2|/√(A² + B²)
Parallel lines with the same A and B are separated by the difference of constants over √(A² + B²).
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