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Angle between lines represented by ax2 + 2hxy + by2 = 0

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Formula: Angle Between Lines

For equation: ax² + 2hxy + by² = 0

\[\Theta=\tan^{-1}\left\{\frac{2\sqrt{(h^{2}-ab)}}{\mid a+b\mid}\right\}\]

or \[\Theta=\sin^{-1}\left\{\frac{2\sqrt{h^{2}-ab}}{\sqrt{\left(a-b\right)^{2}+4h^{2}}}\right\}\]

or \[\Theta=\cos^{-1}\left\{\frac{|a+b|}{\sqrt{\left(a-b\right)^{2}+4h^{2}}}\right\}\]

Maharashtra State Board: Class 12

Formula: Bisectors of Angle

\[\frac{x^2-y^2}{a-b}=\frac{xy}{h}\]

Maharashtra State Board: Class 12

Key Points: Pair of Straight Lines

Lines are perpendicular if: a + b = 0

 Lines are parallel (coincident) if: h² = ab

Perpendicular Pair:

  • Equation: bx² − 2hxy + ay² = 0

Parallel Lines through (x₁, y₁):

  • Equation: a(x − x₁)² + 2h(x − x₁)(y − y₁) + b(y − y₁)² = 0
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