When do I use d = |ax₀+by₀+c|/√(a²+b²) in Straight Lines, and what does it mean?
distance from a point to a line.
d = |ax₀+by₀+c|/√(a²+b²) — distance from a point to a line. Use it when: line ax+by+c=0. Always check the condition holds before plugging in numbers.
Key point
d = |ax₀+by₀+c|/√(a²+b²)
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