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Distance in Lines (Point & Parallel Lines)

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Estimated time: 3 minutes
  • Introduction of Distance of a Point from a Line
  • Distance between two parallel lines
Maharashtra State Board: Class 12

Formula: Distance of a Point from a Line

For point (x₁, y₁) and line ax + by + c = 0,

\[p=\frac{|ax_1+by_1+c|}{\sqrt{a^2+b^2}}\]

Maharashtra State Board: Class 12

Formula: Distance Between Two Parallel Lines

For lines ax + by + c₁ = 0 and ax + by + c₂ = 0,

P = \[\left|\frac{c_{1}-c_{2}}{\sqrt{a^{2}+b^{2}}}\right|\]

Maharashtra State Board: Class 12

Formula: Distance Between A Pair of Parallel Straight Lines

If ax² + 2hxy + by² + 2gx + 2fy + c = 0 represents a pair of parallel straight lines, then the distance between them is given by

\[2\sqrt{\frac{g^{2}-ac}{a(a+b)}}\mathrm{or}2\sqrt{\frac{f^{2}-bc}{b(a+b)}}\]

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